there are a bunch of free patterns available. If you haven't ever 'boxed' a bottom corner, take a flat bag (like a pillowcase) slide a box container into it (like a cereal box) and see what it looks like at the bottom corner. This visual really lets the idea of sewing a triangle make sense. You can do anything to the basic tote - piece it, quilt it, add pockets inside or out and change the size to anything you want. The idea is to create the 2 pieces of fabric and then sew them together. The lining will be the same size and attach it at the top after attaching the straps. Leave a couple inches open in the side of the lining to pull it rightside out and you are done! Everything else is just additions - closures, pockets, adjustable straps, pockets, etc. I like to add a flap to the top to make them more messenger bag style. I make a lot of these for the boys and make sure they are either the size of tablets or laptops. Another fun gift is to add a layer of PUL, or thin vinyl or even insulbright and make them into smaller lunch bags. Careful, when you start making them from your scrap piles, they can be addictive!!!!