This holds all the vitamins, supplements, and prescription pills I need for a full day, plus extra spots for those things it's good to have on hand (like aspirin or Tums). The lid slides into place and should hold fairly securely, so it can go into a backpack, fanny pack, purse, etc. without worry that it'll let the pills slide out, but with a thumb-grip tab to easily tug it open. Should be an easy print with no overhangs, hinges, etc. to worry about. Easy print. You might need to slightly file the outer edge of the lid to make it slide smoothly.