15x15x5 Shipping Boxes — 32 ECT Brown Corrugated

ECT stands for Edge Crush Test, a measure of a box's stacking strength. A 32 ECT rating means the box can withstand 32 pounds of force per lineal inch before crushing. This is the standard minimum grade accepted by major carriers like UPS and FedEx for single-wall corrugated shipping boxes.

The 15x15x5 box is ideal for flat or shallow products including folded apparel, books, framed artwork, documents, electronics accessories, board games, and retail consumer goods. The 5-inch depth accommodates items that don't stack tall, making it a popular choice for e-commerce fulfillment and subscription box packaging.

Yes. The 32 ECT single-wall construction meets the minimum corrugated board strength standards required by UPS and FedEx for parcel shipping. Always verify that your packed box weight does not exceed carrier limits and that contents are properly cushioned inside the box.

32 ECT measures edge crush resistance and relates to stacking strength during transit, which is preferred by modern carriers. 200# Mullen measures burst strength — resistance to puncture. Both are used for single-wall boxes, but ECT-rated boxes are now the industry standard for carrier compliance and are typically more material-efficient.

Yes. Cardboard Boxes 4 U stocks 15x15x5 boxes for immediate fulfillment and offers volume pricing for larger orders. Custom quantities and sizes are also available with a typical lead time of 7–10 business days. Contact the sales team at 888-333-9513 or Sales@cardboardboxes4u.com for bulk pricing.

Inside dimensions refer to the usable interior space of the box, which is what matters for product fit. Outside dimensions are slightly larger due to the thickness of the corrugated walls. The 15x15x5 specification refers to inside dimensions — 15 inches long, 15 inches wide, and 5 inches deep — ensuring your product fits as expected.

The 15x15x5 box is widely used across several industries. E-commerce and retail shippers use them for folded apparel, accessories, and consumer goods. Publishing and media companies rely on them for books, catalogs, and printed materials. Arts and crafts suppliers ship artwork, canvas prints, and framed items in them, while apparel and textile businesses use them to ship neatly folded clothing, reducing void fill and dimensional weight costs.