best self checkout is when the store gives you a handheld device to scan products right b4 you put them in bags in your cart. When you approach the cashier, the

best self checkout is when the store gives you a handheld device to scan products right b4 you put them in bags in your cart. When you approach the cashier, they just scan your qr code and prompt you to pay. After that you just take your bags and go... Even faster if the bags are from bicycle and you just put them in the back and go...