400 Pcs 5 x 7 in Corrugated Cardboard Sheets for Mailers - Flat Pack

In this review the 400 Pcs 5 x 7 in corrugated cardboard sheets are judged primarily on practicality for everyday shipping and craft use. The bottom line: this pack is aimed at small businesses, crafters and home shippers who need a large supply of sturdy flat inserts to keep garments and documents flat during mailing. The most compelling reason to buy is the quantity and consistent 2 mm thickness that delivers reliable support and protection without bulk, making these sheets a sensible, low-cost solution for repetitive mailing or DIY projects.

Key Features

• Bulk pack: 400 pieces provide a long-lasting supply that meets daily application, replacement and sharing needs.
• Compact size: Each 5 x 7 in sheet fits small mailers and picture frames to prevent bending and creasing during transit.
• Consistent thickness: The 2 mm (0.08 in) corrugated flat board is stable in structure and resists breakage and wear.
• Multipurpose use: Sheets can reinforce clothing shipments, act as backing in frames, or be cut for craft projects without heavy tools.
• Traditional finish: The natural brown corrugated surface works well for neutral packaging or rustic craft aesthetics.
• Easy to modify: The material trims cleanly for DIY dividers, boxes and organizers used around home or workshop.

Who It's For

Small ecommerce sellers, crafters and anyone who ships soft goods will find this pack particularly useful because the generous quantity reduces the need to reorder frequently and the 5 x 7 in size suits shirts folded flat, prints and small framed items. It is also a good match for teachers and craft groups that need uniform sheets for classroom projects.

Those who need waterproofing, heavy-duty structural panels or custom pre-cut packaging should look elsewhere, since these are thin corrugated inserts meant for support and protection rather than primary external packaging or moisture protection.

Pros & Cons

Pros

• Large 400-piece quantity is cost-effective for frequent use and sharing.
• 2 mm thickness offers dependable stiffness to keep garments and documents flat.
• Neutral brown color and tradional corrugated texture suit many craft and shipping applications.
• Easy to cut and shape for DIY dividers, boxes and organizers.

Cons

• Not water-resistant, so it will not protect contents from moisture without additional packaging.
• Size is fixed at 5 x 7 in, which may require trimming for some larger items or be too small for others.

Specifications

Brand	Thenshop
Quantity	400 pieces
Size	5 x 7 in (approx 18 x 13 cm)
Thickness	2 mm (0.08 in)
Color	Brown
Material	Corrugated flat board

Our Verdict

The 400 Pcs 5 x 7 in corrugated cardboard sheets are a practical, economical choice for sellers and crafters who need many consistent, thin inserts to protect items in transit or for DIY projects. Given the durable 2 mm construction and useful size, they represent good value for anyone who ships soft goods or runs craft activities that require uniform backing sheets.

Frequently Asked Questions

Are these sheets sturdy enough to keep shirts from wrinkling?
Yes. The 2 mm corrugated flat board offers enough rigidity to keep folded shirts and similar garments flat during typical mailing.

Can these be cut to make dividers or small boxes?
Yes. The sheets trim cleanly and are suitable for DIY dividers, small storage projects and craft builds.

Do these sheets protect against water or heavy impacts?
No. They are not water-resistant and are intended for support and anti-bend protection rather than heavy-impact or moisture protection.