Sometimes you have to wait too long for the delivery boy, they agree to come within a 4-hour window and it sucks. Just do what the grannies do (if you're not ashamed) and get one of these carritos (little grocery carts that you carry behind you on wheels); you can even use it as you go through the shop instead of leaving it at the front wondering if it will be there when you get back. You just have to show the empty cart when you've unloaded all of your groceries on the conveyer belt at checkout.