Duck Canvas Plus Backpack. The Dickies Duck Canvas Backpack Plus is an authentically constructed utility bag made of our timeless duck canvas fabric. Featuring adjustable straps, chest tape, zip closure, mesh side pockets and inside back panel and pocket, available in black, desert sand and brown duck. Measuring 50cm x 30cm x 15cm. A truly hardworking bag made to be put through its paces. Materials: BRUSHED DUCK CANVAS, 100 % COTTON, 12 OZ.