Telescoping Boxes
- 2-piece telescoping design fits irregular items
- Heavy-duty 200#/ECT-32 kraft corrugated walls
- F.O.L. bottom adds structural integrity
ASTM D5118 Certified
ASTM D4727 Certified
CSA Class Code A Certified
4x4x20 Kraft Corrugated Shipping Boxes are single-wall corrugated cardboard boxes designed for shipping long, narrow items. Ideal for rods, tubes, and posters, these stock-size kraft brown boxes offer reliable protection during transit with precise inside dimensions for accurate fitting and cost-effective e-commerce and industrial fulfillment.
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A kraft corrugated box is a shipping carton made from corrugated cardboard — a fluted inner layer sandwiched between flat liner sheets — finished in natural brown (kraft) paper. These boxes are valued for their rigidity, lightweight construction, and crush resistance, making them a reliable choice for standard parcel carrier shipping. Kraft corrugated boxes are also fully recyclable, supporting responsible disposal after use.
Talk to our experts for custom solutions and tailored guidance.
Ships long, narrow products safely to end customers while minimizing dimensional weight charges and void fill waste.
Packages rods, pipes, tubes, and elongated components for safe transit in manufacturing and distribution operations.
Protects fishing rods, golf clubs, curtain rods, and other long sporting equipment during retail or e-commerce shipping.
Safely ships rolled posters, artwork, banners, and printed materials in sturdy corrugated long boxes without damage.
Talk to our experts for custom solutions and tailored guidance.
With over 1,300 corrugated box sizes available, you can find the exact fit for any product — including hard-to-find long and narrow configurations like 4x4x20.
Boxes meet ASTM D5118, ASTM D4727, and CSA Class Code A standards, giving shippers confidence in carrier compliance and freight regulation adherence.
From government-spec corrugated to custom-printed cartons, Cardboard Boxes 4 U delivers specialized packaging solutions beyond standard stock options.
Submit your request and our team will respond with pricing, volume options, and lead times tailored to your shipping needs.
To help us assist you faster, please include the reason for your message so the relevant team can reach out as soon as possible.
To help us assist you faster, please include the reason for your message so the relevant team can reach out as soon as possible.
