We were perusing the fabric store for something specific awhile back and found a variety of fun colorful nylon fabrics that got my wheels turning... Noah will be heading into the big world of kindergarten this fall and I prefer that he carry something distinctive and NOT themed with licensed images. Even with the fabric being a clearance find, the cost of zippers and fabric and strap make this likely to cost more than the products I might have found at the store. Then you add how many hours building it up, and it's hardly worth it, except that he likes it :)
Here's the finished product!
I drew up my own pattern based upon backpacks we have.
And got this stash of products:
The bottle pockets fit perfectly!