I used a print from Cloud 9 House Designer - GeoCentric Canvas. I just had to use half a yard since the straps are not from the fabric. I used a black zipper to match the straps, which are adjustable.
This Backpack is light on weight but roomy and strong. It has a big zippered front pocket and an oval bottom. Inside there's another pocket.
I'm entering this bag on the Travel Handmade: The Crafty Travelers Series from Ellison Lane. Go and check all the links.