Custom Kraft Mailers Guide: What Packaging Details Can Be Customized?

Custom Kraft Mailers are increasingly used for e-commerce shipping, retail fulfillment, fashion products, gifts and selected food delivery applications. Their value, however, is not limited to a natural paper appearance. A well-designed kraft mailer must match the product's dimensions, weight, handling risks, moisture exposure and branding requirements.

What Are Custom Kraft Mailers?

Custom Kraft Mailers are paper-based bags or mailing envelopes manufactured to meet specific packaging requirements. Unlike standard paper shopping bags, they can be designed for shipping, return handling, retail display or short-distance delivery.

Common configurations include:

•Flat kraft paper mailers

•Side-gusseted mailing bags

•Bottom-gusseted bags

•Self-sealing paper mailers

•Custom logo kraft mailers

•Wax-coated kraft paper bags

•Return-ready mailers with two adhesive strips

Custom Kraft Mailers are usually for clothing, accessories, documents, cosmetics and bakery items and similar medium and lightweight products. Products with points, heavy weight in small spaces, or high moisture exposure, may require a more reinforced, cushioned, or different packaging structure.

Which Kraft Paper Materials Can Be Customized?

The selection of materials can affect strength, print quality, appearance, moisture resistance, and end-of-life options.

Kraft Paper Type	Main Characteristics	Suitable Applications
Natural brown kraft	Visible fibers and natural appearance	Fashion, handmade goods, eco-focused retail
White kraft	Cleaner print background and sharper colors	Cosmetics, gifts and branded e-commerce
Recycled kraft	Contains recovered fiber	General retail and sustainability-focused packaging
Wax-coated kraft	Improved resistance to grease and humidity	Food delivery, bakery and moisture-sensitive goods

Natural Brown Kraft Paper

Natural brown kraft paper gives Custom Kraft Mailers a very distinctive and organic appearance. It works particularly well with black, dark green, navy or other high-contrast inks.

Because the paper itself is brown, pale colors may appear less saturated. Detailed multicolor artwork may require white ink or another base layer.

White Kraft Paper

White kraft provides a more neutral printing surface. It is commonly selected for printed kraft mailers that require:

•Fine text

•Multiple colors

•Detailed illustrations

•More consistent logo reproduction

•A cleaner retail presentation

Any coating or whitening treatment should be reviewed alongside the intended recycling requirements.

Recycled Kraft Paper

Recycled Custom Kraft Mailers may contain pre-consumer or post-consumer fiber. Recycled content can reduce virgin fiber use, but it may also affect:

•Surface smoothness

•Paper shade

•Fiber strength

•Fold performance

•Print consistency

The highest recycled percentage is not automatically the best technical choice. Material performance should remain appropriate for the packed product.

Wax-Coated Kraft Paper

Used for takeaway foods, baked goods, cosmetics, and small retail items, wax-coated kraft bags are moisture, grease, and spill barriers. They provide some resistance against seepage.

While wax coating provides some level of protection, wax-coated custom kraft mailers are not fully waterproof. The coating's chemistry and application weight contribute to how heat resistant, how strongly the adhesive bonds to the paper, and its recyclability.

How to Select the Right Paper Weight

Paper weight dictates the flexibility, tear strength, and puncture resistance of kraft mailers and determines printing quality and final cost. Selecting within the following ranges is a good starting point for Custom Kraft Mailers:

Product Category	Typical Paper Weight	Selection Focus
Clothing and textiles	80–120 gsm	Flexible construction; greater tear strength
Jewelry and small accessories	100–140 gsm	Stiffness; smooth surface; clear printing
Books and stationery	120–180 gsm	Increased puncture resistance; reinforced seams
Food delivery and bakery items	80–140 gsm	Custom coating options can provide wax and/or grease resistance
Multiple-item orders	120–180 gsm	Paper with gussets (strengthened) along the side or bottom of the package
Heavier or sharp-edged products	150–220 gsm	Foam-like padding with reinforcement and increased puncture resistance

Reducing the weight of kraft paper decreases the cost of shipping paper and the thickness of the package. However, lower weight paper is more susceptible to tearing and creasing. Increasing the weight of the paper also increases its rigidity but increases the cost of the package.

These values can be considered estimates only. Manufacturing Custom Kraft Mailers will be subject to complete specifications upon receiving a physical sample of the product, weight of packed product, closure type, and the environment of transportation. Bulk production is recommended.

How are Custom Kraft Mailer Sizes Determined?

Sizing identifies the favorable dimensions of the product so that excess material is not used and the closure is not over-stressed during the sealing process.

Buyers should provide:

•Product length, width and thickness

•Total packed weight

•Quantity of items per mailer

•Cushioning or inner wrapping requirements

•Required gusset depth

•Filling allowance

•Closure area

•Acceptable size tolerance

A practical sizing sequence is:

Measure the packed product → add cushioning space → allow for product insertion → calculate gusset expansion → reserve the sealing area → test a physical sample.

Oversized Custom Kraft Mailers increase material use and package movement. Undersized mailers can cause seam splitting, distorted printing or adhesive failure.

What Structural Details Are Customizable?

Flat Mailers

Flat Custom Kraft Mailers are excellent for low profile products and can hold garments, documents, and scarves. They use less material and are easy to store and pack.

Side Gussets

Custom Kraft Mailers with side gussets help to increase the internal capacity of these mailing bags. Some examples of what can be contained in this mailing bag include:

•Folded clothes

•Multiple Items

•Boxed accessories

•Irregular shaped items

•Thick Items

When adding a gusset, the depth of the packed items should be the measurement of the gusset. Excess space in a gusset can cause the item to be unstable and increase the amount of material needed.

Bottom Gussets

Custom Kraft Mailers with a bottom gusset give the bag additional low volume, and help the packaged item to hold its shape. It is typically used for food mailers, larger retail items, and larger multiple item deliveries.

Reinforced Seams and Openings

Reinforced edges, folded tops and strengthened bottoms can improve carrying performance. Reinforcement should be added selectively because it also increases material use and manufacturing steps.

What Closure Options Are Available?

Closure Option	Main Benefit	Typical Use
Self-seal strip	Fast packing without extra tape	E-commerce fulfillment
Double adhesive strips	Supports outbound shipping and returns	Fashion and footwear
Tear strip	Controlled, convenient opening	Branded online orders
Fold-over closure	Simple and flexible	Gifts and small production runs
Machine sealing	Supports automated workflows	Selected coated paper structures

It is necessary to test for adhesion to various paper surfaces, potential storage environments, and expected relative humidity. Wax coatings may deteriorate adhesion when sealing the paper

How Can Custom Kraft Mailers be Printed?

Packaging which is designed for functionality can be adapted for printed packaging which is used as a brand touchpoint. The paper and the extent of the production may determine the viable printing method.

Digital Printing

Digital printing is particularly well-suited for:

•Low production volume

•Seasonal packaging

•Multiple designs

•Prototype packaging

•Custom graphics

Flexographic Printing

For medium to large production runs, Flexographic printing is probably going to be the most viable option after the first production run since printing plates are required.

Printing Method	Best Suited To	Main Consideration
Digital printing	Small or variable orders	Heavy ink coverage may increase cost
Flexographic printing	Repeat bulk production	Plate preparation is required
Spot-color printing	Defined brand colors	Kraft paper alters final color appearance
Full-surface printing	High visual impact	Requires tighter registration control

For brown Custom Kraft Mailers, the best practice is to evaluate artwork on the actual substrate rather than the digital file. Printed graphics can also change depending on folds, gussets, and sealing areas.

The Effect of Wax Coating on Custom Kraft Mailers

Wax-coated Custom Kraft Mailers can be a solution that:

•Delays the absorption of moisture

•Increases resistance to grease

•Prevents light spills

•Enhances performance with humidity

•Increases resistance to scuffs from short period deliveries

They can be used on bakery items, take-away products, cosmetics and other retail products that are moisture sensitive. Some wax coatings can soften from high temperatures. Coating mailers too much can negatively impact folding, sealing and disposal.

Durability and Sustainability

Custom Kraft Mailers with the best sustainability usually have a better balance of coating and durability. Packaging mailers have to protect the product while keeping the mailers as light as possible and with the least amount of coatings.

A balanced design should:

•Use a size that closely fits the product

•Avoid unnecessary mixed-material components

•Apply coatings only where protection is required

•Prevent product damage and repeat shipping

•Use an appropriate paper weight

•Consider local recycling infrastructure

Using a properly designed mailer reduces waste and prevents damage. Damage can occur during the selection of materials and the failures of the packaging itself.

Final Thoughts

Custom Kraft Mailers are designed to protect the products they ship and handle the returns. GT GROUP offers custom Kraft and wax paper bags. These can be used in e-commerce, retail, and food delivery. With the variety of Kraft paper, sustainability, strength, custom sizes, and wax, we will help determine the best option for you. We also help provide Custom Kraft Mailers depending on your purpose. Contact GT GROUP with your product size and weight along with any artwork and usage requirements, to discuss the right Custom Kraft Mailers for your application.

FAQs

Q1. What can GT GROUP customize on Custom Kraft Mailers?

Custom Kraft Mailers can be customized based on paper type, weight, and dimensions, closure style or gussets, printing, and surface treatment. Add-ons may include the functional features of a mailer such as a wax coating, tear strips, and return seals, as well as handles.

Q2. What paper options do Custom Kraft Mailers have?

Natural brown kraft paper, white kraft paper, and recycled kraft paper are some paper options Custom Kraft Mailers may be made from, depending on the application. GT GROUP can assess the material based on both appearance and printing as well as the mailers' protection from moisture.

Q3. What paper weight should I choose?

Depending on the application, common ranges may be approximately 80-120 gsm for clothing, 100-140 gsm for accessories, and 120-180 gsm for books or multi-item orders. The final specification should be confirmed through product packing and transport tests.

Q4. Can GT GROUP manufacture custom sized kraft mailers?

Yes, they can manufacture custom sized kraft mailers. Custom mailer sizes can be designed around product length, width, thickness, packed weight, cushioning space, gusset depth and closure. This helps eliminate excess space and waste.

Q5. Can full color graphics and logos be printed?

Custom Kraft Mailers can have product information, logos, instructions, QR codes, and patterns printed on them. Digital printing is better suited for smaller orders and variations, while flexographic printing is better-suited for long production runs.