Zip top bag lined. This is technically a lunch bag pattern, but it could be just any generic zip top tote bag.
Chubby Lunch Tote - Free Sewing Pattern! — SewCanShe | Free Daily Sewing Tutorials
Make your own insulated lunch bags with your favorite fabrics. Includes make your own laminated fabrics for a wipe-clean option too.
A different way to put together a simple bag, from the side, not the top. Diary of a Quilter - a quilt blog: Easy Fat Quarter Bag Tutorial
Easy Sewing Projects to Sell - Button Lunch Bags - DIY Sewing Ideas for Your Craft Business. Make Money with these Simple Gift Ideas, Free Patterns, Products from Fabric Scraps, Cute Kids Tutorials http://diyjoy.com/sewing-crafts-to-make-and-sell
http://www.craftpassion.com/2014/09/lunch-box-bag.html Lunch Box Bag
Free Bag Pattern and Tutorial - Lunch Bag
The Peas and Corn Lunch Bag - PDF Sewing Tutorial + How to Organize a Craft Room