Mailer boxes(also known as shipping boxes or aircraft boxes) are widely used in packaging and e-commerce due to their sturdy structure and easy assembly. Depending on the product type and usage scenario, different closure methods can enhance both functionality and presentation. In this article, we’ll walk you through five common closure styles for mailer boxes to help you choose the best option for your packaging needs.

1. Self-Locking Closure (Tuck-in Flap)

Self-locking mailer boxes use built-in flaps that tuck into the box to secure the lid without the need for tape or glue.

Advantages: Easy to assemble, clean appearance, reusable, and eco-friendly.

Best for: Gift packaging, small product shipping, custom brand boxes.

2. Tape or Sticker Closure

This method involves sealing the box with packing tape, kraft tape, orcustom logo stickersonce it’s folded closed.

Advantages: Easy to apply, provides a secure seal, and allows for branding when using printed stickers.

Best for: Logistics, e-commerce shipping, larger or heavier items, and branded packaging.

3. Double-Sided Adhesive Closure

These boxes come pre-applied with double-sided adhesive tape. Simply peel off the protective strip and press to seal.

Advantages: Time-saving, clean finish, no additional tools required.

Best for: Branded packaging, fashion packaging, efficient e-commerce fulfillment.

4. Tear Strip Closure (Easy-Open Line)

This design includes a tear strip for easy opening and sometimes features a resealable option.

Advantages: Enhances unboxing experience, tamper-evident, and ideal for premium presentation.

Best for: Beauty products, accessories, high-end apparel, brand packaging.

5. Lock Tab Closure

The box lid features tabs that insert into slots on the box body, securely locking it in place without tape or glue.

Advantages: Secure and reusable, tape-free and environmentally friendly.

Best for: Creative packaging, eco-conscious products, gift boxes.