BOX USA Long Cardboard Boxes 37in x 3in x 3in Pack of 25 - Sturdy

In this review of the BOX USA Long Cardboard Boxes, the bottom line is simple: these 37in square mailing tubes are a practical choice for anyone who ships or stores long, flat artwork and documents and wants an easy-to-assemble, space-saving option. The single biggest reason to buy is their combination of lightweight construction and user-friendly assembly: the one-piece tubes ship flat, fold together without tape or glue, and include caps for secure mailing. They are designed for posters, blueprints and long-format prints where a square tube that will not roll is an advantage.

Key Features

• Heavy duty capacity: Each tube is designed to handle heavy loads and the construction supports shipping and storage requirements for single wall packaging.
• Square, non-rolling design: The 3 x 3 in square profile prevents tubes from rolling in transit and makes packing and stacking easier than round tubes.
• Flat ship and quick assembly: Tubes arrive flat to save space and fold together quickly without tape or glue, speeding up packing tasks.
• Unprinted, recyclable material: Made from plain white corrugated cardboard that is 100% recyclable and reusable for simple, eco-friendly packaging.
• Includes caps and bulk value: Each pack contains 25 tubes with end caps, offering a cost-effective bundle for frequent shippers or studios.
• Proudly made in the USA: Manufactured domestically from Aviditi materials to standard corrugated specifications.

Who It's For

These tubes suit artists, graphic designers, architects, and small businesses that regularly mail or store posters, blueprints, long prints, charts and similar flat media. The square shape is especially useful when bundling or storing items on shelves where rolling tubes would be inconvenient.

Those who need maximum rigidity or thicker walls for very fragile or heavy items should consider a heavier multiwall option; some users report the cardboard feels thin, so if a project needs extra crush protection or long-term archival storage, a reinforced tube may be a better fit.

Pros & Cons

Pros

• Easy, fast assembly with tubes that ship flat and fold without tape or glue.
• Square shape prevents rolling and makes packing and storage neater.
• Good value in a 25 pack with caps included for frequent use.
• Lightweight and recyclable construction for simple, eco-conscious shipping.

Cons

• Cardboard thickness can feel thin for some heavier or fragile items, so extra padding may be required.
• Sturdiness opinions vary among users; those needing high crush resistance might want a thicker or double-wall tube.

Specifications

Product type	Square mailing tube
Dimensions	37 in x 3 in x 3 in
Pack quantity	25 tubes
Material	White single-layer corrugated cardboard
Construction	One-piece foldable tube with caps, ships flat
Edge crush test	32 lb ECT (200# corrugated)
Made in	USA

Our Verdict

For art studios, schools, architects, and small shippers who need an affordable, space-saving way to mail or store long prints, these BOX USA 37in square tubes are a solid value. They excel at quick assembly and preventing roll, and the 25 pack plus caps makes them practical for frequent use; just factor in extra padding for heavier or delicate items where the single-layer cardboard may feel thin.

Frequently Asked Questions

Are caps included?
Yes, the tubes include caps so they arrive ready for mailing or storage.

Do these tubes roll during shipping?
The 3 x 3 in square design prevents rolling and makes stacking or bundling easier than round tubes.

Can they hold heavy items?
They are rated to meet single wall shipping requirements and the construction supports typical poster and blueprint weights, but very heavy or fragile goods may need extra reinforcement or a thicker tube.