You can make a roll top back pack like this one out of an old wool blazer and three leather belts. Delia from Delia Creates shares a tutorial at Baby Lock’s Totally Stitchin’ blog showing how. You should be able to find the blazer and all the belts you need in one trip to a thrift store.
Click the link below for her tutorial:
[photo from Delia Creates on Totally Stitchin’]