At the supermarket or
Walmart, etc. do you organize your items on the belt or just load it randomly?
I usually use self-checkout but for larger orders I like to place similar items together, frozen, refrigerated, produce, non-foods, etc, with lightweight items like bread and potato chips last.
Oh, and heavy items first, like gallons of milk, 6 packs of soda, canisters of detergent pods, etc.