Sewing a tote bag with flat bottom and lining is quicker and easier than you might think. No grocery bag pattern needed, just follow our step by step diy shopping bag video and whip up one in minutes Step 7 make the flat bottom. How to make the grocery bag with a flat bottom in the movie aquaman there is this scene where the king of atlantis decides to throw back all the plastic waste (and other pollutants) deposited in the. I’ll show you how to make a tote bag step by step from the dimensions for cutting to the construction process.