[SoftTalker]

Yeah if you're going to walk with groceries, use a mesh or canvas bag with handles, or a grocery basket/cart if you're buying more than a few items. Carrying paper bags sucks because you have to hold them in your arms and support the bottom of the bag.

[wheels]

In many countries adults just continue to wear backpacks. One of the things I keep in my backpack is a big IKEA bag, meaning I'm pretty set for shopping on foot (or bike, which is more common for me). Medium sized purchases go in the backpack, larger things go in the IKEA bag.