Plain brown sheets constructed of one 175 test C flute and one 32 ECT B flute test which give you a 200# bursting strength. Approximately 5/16 thick.
Use double wall corrugated sheets to stack heavy items It is manufactured from 275# DW/ECT-48 kraft corrugated It provides extra durability and
Aviditi Double Wall Corrugated Cardboard Sheets, 48 x 72, Kraft, Pack of 5,SP4872DW
Corrugated Rolls
4mm Twin-Wall Corrugated Plastic 8' Wide - Growers Supply
Corrugated Plastic
Corrugated Cardboard Sheets 4mm - 3/16 Thick 5x7- 5 Pack. Filler Insert Pads, Brown Frame Backing Rectangular & Square Flat Boards for Art&Crafts, DIY Projects, Mailing,Dividers & Packaging
Double Wall Corrugated Sheets: Paper Mart Packaging
Coroplast 36 in. x 72 in. x 0.157 in. (4mm) White Corrugated Twinwall Plastic Sheet COR-3672 - The Home Depot
AVIDITI Corrugated Cardboard Sheets 20 x 24 (5 Pack) Large Card Board for Layer Separation Packaging Mailing Shipping Packing, and Protecting Products from Forklift Damage - 5 Pack : Office Products
Falken Design Twin Wall Polycarbonate sheet is a multi-wall Polycarbonate sheeting that features at least a twin wall structure with interconnected channels that create small pockets of airspace in between them that enhance the strength of the polycarbonate and reduce the impact of thermal transfer. These pockets of air provide additional insulation in the space and can reduce energy costs. Clear Twin Wall Polycarbonate Sheet commonly is used for canopies and other small building structures.
24 in. W x 72 in. L x 0.25 in. T Clear Twin Wall Polycarbonate Sheet
Double Wall Corrugated Sheets: Paper Mart Packaging