Since I usually self check at Walmart and other places that have it, I place the big items in the cart with the bar code accessible for hand scanning without removal, frozen/refridgerated items generally together, everything else in cart doesn't really matter to me. The upper cart space (where toddlers/baby could go) is where I place my eggs, bread, and fresh veggies. Then I scan in this order: Frozen items, regular cart items, eggs/bread, weighed veggies, (bagging and putting back in the cart as i scan them) lastly use the hand scanner for the big items. Sometimes I scan the big items first if i know i need to place bags on top. Once I see that everything has been bagged and back in the cart, then I'm confident that I didn't miss anything, pay, and then GTFO. I'm an efficient self checkout machine, haha