A "canvas backpack" refers to a type of bag that is made from a sturdy fabric called canvas. It is usually used for carrying items such as books, clothes, or personal belongings and is known for its durability and strength. Full definition
This owl pattern canvas backpack is one of my favorite backpacks I have seen so far. (noragouma.com)
Our traveler canvas backpack with a water resistant taslan inner liner, antique brass buckles, webbed cotton adjustable straps and a heavyweight washed canvas. (mitscoots.com)
Your regular old canvas backpack will feel like new again after stitching in a few honeycombs. (thespruce.com)