Harper Kids Backpack - pattern from http://ithinksew.com
Learn how to sew wallets. 3 patterns included and the video tutorials show you every step of the way. Lots of great sewing tips to get the best results.
Video tutorial for how to sew the Sandra Saddle Bag pattern.
Might just have to make my own if I can't find one for a reasonable price in stores near me.
Tons of Great Free Bag Patterns to Sew
Drawstring Backpack - Super Easy More
Drawstring bag tutorial - tie a knot or two
Madder Root Dyed Pure Linen Drawstring Backpack by WhiteChairShop
How To Make A Drawstring Backpack
Adjustable drawstring backpack/ Cotton canvas rucksack on Etsy, $60.37