For years in Japan, I never knew this little trick until I saw someone do it...
Did you know that the small supermarket shopping carts are designed so that the height can fit right above the table where you pack your groceries?
BOOM! Just like that, and the little space-saver cart is now right beside you at the table. You don't need to twist your body around to reach for the pack of pork and the head of lettuce just to twist yourself back again to stuff them into your bag!
More importantly, the cart is no longer sitting behind me and tripping everyone who is walking out from the supermarket. It's both space-efficient and good manners. If you didn't know that, give it a try next time!~