4" x 4" x 4" 32 ECT Cardboard Shipping Boxes Kraft Brown 25/Bundle | eBay
Corrugated Boxes 12 x 4 x 4" ECT-32 25 Pack Kraft Cartons | eBay
Mullen vs. ECT—Which is Better for Your Packaging? | Packsize
Mecmesin | Edge Crush Test (ECT) of corrugated cardboard
How to know the required resistance of your cardboard box - Kibox
14" x 10" x 8" Corrugated Box, Single Wall, 200#/ECT-32
Amazon.com: Aviditi Oyster White ECT-32-B/200# Die-Cut Corrugated Easy-Fold Mailers, 10 1/4" L x 8 1/4" W x 1 1/4" H, Pack of 50, Great for Shipping and Packaging : Office Products
24" x 20" x 18" 32 ECT Corrugated Carton - onepack.com