The Ultimate Buyer's Guide for Purchasing Custom Poly Mailer Bag

07, Apr. 2025

 

The Ultimate Poly Mailer Size Guide: Choosing the Right Fit for Your B

Global shipping has skyrocketed by 150 percent in the past decade. Whether you’re sending your items locally, transporting them across the U.S., or selling your products worldwide, the right packaging solution can help your business grow and succeed.

With competitive price and timely delivery, Ecobag sincerely hope to be your supplier and partner.

While boxes are a common shipping staple, they can create unnecessary bulk and expense when distributing many kinds of products. Most cardboard boxes aren’t weather-resistant, take up more space, and cost more to transport than other lightweight shipping solutions.      

That’s where poly mailers come in. Our wholesale poly mailers and bulk poly mailers bags are a versatile and affordable way to ship a variety of products.  Our wide range of mailers size, which include 6” x 9” Poly Mailers, 7.5” x 10.5” Poly Mailers, 9” x 12” Poly Mailers, 10” x 13” Poly Mailers, 12” x 15.5” Poly Mailers, 14.5” x 19” Poly Mailers, 19” x 24” Poly Mailers, and 24” x 24” Poly Mailers, offer the perfect fit for your shipping needs.

What is a Poly Mailer?

Poly Mailers or shipping poly mailers are envelope bags that are made from Low-Density Polyethylene (LDPE). This lightweight, flexible, and durable material ensures that poly mailers are both tear-resistant and resistant to dust, dirt, and weather. As a result, these mailers bags are an excellent alternative to traditional cardboard boxes or corrugated packaging.

Mailer bags usually contain an anti-tamper seal that keeps your product safe, secure, and intact until this seal is torn open.

If you’ve ever received a t-shirt, hoodie, or personal care item in the mail, chances are it came in a thin, flexible, and sturdy shipping bag. If you ship products regularly, these tear-resistant bags can shield your goods from external elements or contamination. These envelopes are also easier for your customers to open and dispose of via recycling instead of having to break down and throw away bulky cardboard boxes.

Many industries use mailers bags to ship items to customers USPS, FedEx, or UPS. Our custom poly mailers are the perfect moisture-resistant and protective way to send many kinds of soft, non-fragile, and lightweight to medium-weight products such as apparel or household items wherever they need to go.

Since mailers weigh less and take up less space than regular bulky packaging, they also cost less to transport and ship. If you’re short on storage space, our mailers lie flat and take up a fraction of space compared to bulkier envelopes, corrugated materials, and cardboard boxes. Lower shipping costs also frees up more money that can go back into running your business.

Our bulk poly mailers come in many sizes with clear or customizable options, and are easy to add your business brand, colors, or logo to help identify or advertise your company.

Overall, custom poly mailers have multiple benefits that make them a must-have supply to optimize your shipping process.

Are There Different Types of Poly Mailers?

At Elements Supply, we offer many different size mailers to accommodate different kinds of applications.  

Our wholesale poly mailers bags sizes include:

  • 6” x 9” Poly Mailers
  • 5” x 10.5” Poly Mailers
  • 9” x 12” Poly Mailers
  • 10” x 13” Poly Mailers
  • 12” x 15.5” Poly Mailers
  • 14.5” x 19” Poly Mailers
  • 19” x 24” Poly Mailers
  • 24” x 24” Poly Mailers

If you need a particular custom size, feel free to contact us to discuss specific details.

What is the Purpose of Poly Mailers?

LDPE mailers are used to protect soft or non-breakable items such as apparel, toys, household items, personal care products, craft supplies, and much more during transport.

Due to their flexibility and durability, these bags can fit many different product kinds and sizes without the risk of breaking, spilling, or incurring weather damage.

Are There Other Kinds of Mailers?

Yes, we also carry bubble mailers and kraft mailers which can solve different kinds of packaging needs.

Kraft Mailers

Kraft mailers refer to a lightweight shipping envelope that is made from kraft cardboard materials. Just like poly mailers, kraft mailers come in multiple sizes to accommodate and transport a variety of products.

Our kraft mailers are more rigid than poly mailers, which makes them a good choice to ship items that need to stay flat without bending. They’re also an excellent option for flat or soft items that won’t get damaged if the stiff paper envelope becomes bent or crushed. Kraft mailer material is also customizable to apply your company’s logo or brand information.

Kraft mailers are also 100% recyclable so they can easily be disposed of in curbside recycling programs.

It’s important to know that kraft mailers aren’t flexible and fully weather-resistant like plastic mailers because they are crafted from paper rather than a plastic film that naturally sheds water. This means that kraft mailers offer protection from handling and light protection from the elements but won’t stay completely waterproof.

If you need to insert a bulky or oddly shaped product or need to protect a product from dirt, dust, or rain, poly mailers may be the right solution for you. They offer superior protection and greater flexibility than kraft mailers.

Bubble Mailers

A bubble mailer offers extra padded protection compared to kraft mailers. Bubble mailers feature a layer of bubble-wrap lining inside a paper envelope.

Just like poly mailers, bubble mailers are easy to store, but they take up a little more room due to their added padded thickness. These mailers come in different measurements and are typically used for items that are too sharp or fragile to ship in kraft or poly mailers. They are also easy to customize with your brand’s name or logo.

When you use bubble mailers instead of traditional shipping cartons filled with packing peanuts or bubble wrap, you also make things easier for your customers since they won’t need to deal with the mess that these packing materials can create.

Compared to poly mailers, bubble mailers may cost more wholesale, aren’t stretchable, and are somewhat bulkier to store. If you want the lightest, hassle-free, and flexible non-padded packaging solution, then custom poly mailers are the way to go.    

What Types of Industries Use Shipping Poly Mailers?

Poly mailers are a standard packaging solution that is used by almost any kind of industry. Clear poly mailers are often employed by ecommerce companies who want a simple and cost-effective way to ship their items to consumers.

Small businesses, medium-sized companies, and even mega-corporations use these mailers to transport and deliver multi-millions of goods each year. Since these bags are the most economical, weather-resistance, and tamper-resistant way to send products via a carrier, almost every kind of industry will use some size of mailer envelope to cut costs, increase revenue, and optimize their packaging operations.

Our size guide can help you pick the best option for your product application.

What Kinds of Poly Mailers Do You Carry?

2 Mil Poly Mailers: These envelopes feature an opaque exterior with a silver lining and are suitable for lightweight applications.

2.5 Mil Poly Mailers: These industry-standard poly mailers are the most common kind of mailer across multiple industries. The bags’ lightweight thickness means that they weigh practically nothing while providing flexible and weather-resistant packaging for many kinds of products. It’s easy to seal these packages with a clear, pull-off adhesive strip that is folded over the end of the bag to close it.

Clear Poly Mailers: Our clear poly mailing envelopes feature an opaque white side on the one hand and a clear side on the other. These kinds of envelopes are a great solution for those who want to advertise the product that they are shipping. Clear poly mailers are often used to send print media items such as magazines and other types of literature.

Poly Mailers Size Guide                                   

Getting the right size mailers is essential before buying bulk poly mailers. Once you know how to measure to ensure the proper mailer size, you can purchase poly mailers wholesale with confidence that they will fit your product.

Accurate measurements are particularly important if an item is bulky or has an irregular shape. A general guide for mailers is to ensure that the bag is just large enough to fit an item securely inside the mailer. The bigger your item measures, the larger your mailer dimensions will need to be.

This method helps prevent damage and wear and tear from a product sliding around inside the mailer envelope. Buying the right size also helps save money since buying too big a size bulk poly mailers bags can lead to excess wasted materials. Getting the right fit means that you can buy more wholesale bags that you pay for the cost per unit and leaves more money in your pocket at the end of the day.     

You can use this guide to help you choose the custom size for all your business needs. We offer 6” x 9” Polly Mailers, 7.5” x 10.5” Poly Mailers, 9” x 12” Poly Mailers, 10” x 13” Poly Mailers, and 24” x 24” Poly Mailers, and more that will give you the best fit for your application and money. For instance, you can get 1,000 9” x 12” poly mailers bags for a wholesale price of just $60.00 (excluding any shipping charges).

Follow our size guide below to determine how to measure your product’s dimensions and estimate the best size poly mailer bags required to fit it.

Guide Method 1

Step 1:

Take a tape measure or a ruler and use it to measure the length, depth, and width of your product.

Step 2:

Once you know your product’s dimensions, check our poly mailers collection for mailers bags that have approximately the same size or larger than the item that you want to ship.

Make sure to size up slightly to ensure that your products can easily slide in and out of the envelopes without stretching the material or rattling around in the bag.  

For example, if you are mailing a flat 8.5” x 11” product, you should choose a 9” x 12” poly mailer bag.

Guide Method 2

In this second part of the guide, we’ve broken down the basic formula to determine how to choose the right size mailers for your business.

Step 1

Width+Depth+1=The minimum width needed to fit a product in a mailer bag.

The width refers to your product’s width in addition to its thickness or depth. Add 1 inch to this measurement to find out the minimum mailer width to use.

Step 2

Length+Depth+2=The minimum mailer length required. After measuring your product’s length and depth (thickness), add 2 inches to this number to determine how long a mailer bag needs to be to fit your product.

For instance

A product that is 8 inches long, 6 inches wide, and 2 inches deep requires a mailer bag with a minimum of 9” x 12” dimensions.

The company is the world’s best Custom Poly Mailer Bag supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

This calculates to 8+2+2=12 inches for the minimum length needed and 6+2+1 = 9 inches for the minimum width needed.

Once you know your product’s dimensions and add a necessary inch or two for space, it’s simple to buy poly mailers wholesale in the knowledge that they will accommodate your specific application.

Final Thoughts

Choosing the right poly mailer size for your products doesn’t have to be difficult. Whether you’re shipping kitchen goods, apparel, small parts, or more, we have the perfect mailer size and customizations for all your packaging needs.

Our size guide and customer service team are here to help you get a customized fit that protects your product during delivery at an affordable wholesale price every step of the way.

Poly Bags Types and Uses - Pack Secure

From sacks of rubble to portions of food, we're all reliant on poly bags. 

The global plastic bag and sack industry is worth a staggering $8.4 billion and is projected to grow to $18.5 billion over the next 6 years. Whether you work in construction, retail, or food service, poly bags are essential. They keep items safe and clean during shipping and distribution.

Let's dig a little deeper into what poly bags are and what you need to know about them.

What Are Poly Bags?

Poly bags are the bags we all take for granted, day in, day out. 

They're what sliced bread comes wrapped in. And at the other end of the scale, they're what bags of sand and stone chippings get delivered in when you're remodeling your backyard. 

Most poly bags are made of polyethylene. Polyethylene is a plastic that comes in different grades, depending on the application. It's the most common plastic on the planet, accounting for more than a third of all plastics produced.

The bottom line is this: if you've got something that needs bagging, there's probably a poly bag solution just waiting for you.

Poly Bag Materials

There are five common grades of poly bags. We're going to examine when you should use each type.  These poly bag types are:

High-Density Polyethylene (HDPE)

All forms of polyethylene come from the same product - ethylene gas. As it polymerizes, it creates chains of hydrocarbons. These chains branch in different ways and create a variety of polyethylene materials.

High-density polyethylene has many chains of hydrocarbons. This makes it strong and dense, but less flexible than other types.

This makes it perfect for:

  • Construction materials, like stone chippings 
  • Auto parts with sharp or pointed edges
  • Bulk quantities of dried foodstuff, like grains and pulses

It is also heat resistant to over 212°F/100°C.

Low-Density Polyethylene (LDPE)

Low-density polyethylene is less strong but no less valuable than HDPE. 

It is crystal clear, which is perfect when you want customers to see exactly what's inside the package. It also tears easily, which is ideal for allowing customers easy access to what they've just bought.

These qualities make them perfect for flat poly bags on a roll that can be torn off as needed. They come in a range of sizes and are durable and convenient. They're also great as packaging materials for small items and for food sales.

Linear Low-Density Polyethylene (LLDPE)

LLDPE is an even more flexible form of polyethylene, but this means that it is not as strong as LDPE.

It has a lower heat resistance and becomes hyper-flexible over 68°F (20°C). But it still has excellent chemical resistance, which makes it food-safe. Even though it is lighter and less dense than LDPE, it is stronger and more puncture resistant. 

They are typically used in the produce section where bags need to be strong but are not designed for long-term use. They are not as transparent as LDPE bags. 

Medium Density Polyethylene (MDPE)

As you'll have guessed, medium-density polyethylene bags sit right between their high-density and low-density cousins.

They're in-between in terms of strength but are extremely hardwearing. They're great when you need a poly bag that will provide a moisture barrier during shipping.

Polypropylene (PP)

Moving away from the polyethylene family, polypropylene bags are less flexible but extremely clear. They're also food safe, making them perfect for displaying goods for sale. They're also suitable for hardware as they're tough to break.

They provide excellent protection against dust and moisture.

Types of Poly Bags

There are three main poly bag types. They are flat, gusseted, and reclosable. 

Flat Poly Bags

Flat poly bags are extremely versatile. They're ideal for food, electronics, hardware, and much more. They can come individually or on a roll for additional ease of use. 

Gusseted Poly Bags

Gusseted poly bags have extra material along the bottom. This allows the bag to stand when full, making packing and storage easier. It's also perfect when items like small bottles need to be stored upright.

Reclosable Zipper Bags

Available in both food and non-food grade, a reclosable poly bag offers your customer extra convenience. They give customers more options, and gusseted options allow goods to stand upright.

They also come in tamper-evident varieties that are perfect for law enforcement.

Colored Poly Bags

Are you looking to make your products pop on the shelf? Why not choose colored poly bags. They come in all the shades of the rainbow and are bound to draw the customer's eye.

Poly Bags Mil Strength

Poly bags come in different thicknesses. Their strength increases as they get thicker. 

1 mil - very light, suitable for temporary storage, such as garbage bags

2 mil - most common thickness, used for products of light and medium weight

3 mil - the next level up, this offers more puncture resistance at an affordable price point

4 mil - this is suitable for items that need more puncture resistance

5 mil - most suitable for industrial settings

6 mil - the best level of puncture resistance, making it suitable for sharp and pointed items

Uses for Poly Bags

From food to shipping, let's explore the uses of poly bags. We've even thrown in a couple you might not have thought of!

Food Bags

Food bags come in a wide range of thicknesses, from 1 mil to 6 mil. But they also come in a variety of sizes. Whether you're selling tiny portions and need a 1.5 x 2 inch bag or need 20 x 24 bags for larger applications, food safe reclosable bags are the way to go.

Box Liners

Are you shipping frozen or fresh products?  Bin Liners have got you covered. They have the thickness to provide excellent puncture resistance and are available in a wide range of sizes.

They also make excellent pallet covers to provide extra protection in transit.

Mailer Bags

Customers hate getting items delivered in huge, oversized cardboard boxes. Instead, use poly bags for shipping.  Their toughness and durability make them ideal for a wide range of products. 

Some poly bags give you even more flexibility. They have a second adhesive strip that allows customers to return items with ease.

Ice Bags

A survey found that 51% of Americans buy 400 pounds of ice each year. If you're going to cash in on that stat, you need ice bags, stat!

They come in twist tie or wicketed options and offer high strength even at low temperatures.

Poly Tubing

There's no need to be constrained by fixed-sized bags with poly tubing. Simply cut it to the size you want and heat seal each end to make your own custom bags. You can also seal the ends with staples or tape.

Choose Pack Secure for All Your Poly Bag Needs

At Pack Secure, we've got all types of poly bags for sale. Whether you need food-grade poly bags or colored bags for display, we've got you covered.

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