If you live within 1 mile of a grocery store you could easily walk, and you don’t need anything else on a regular basis. Use a bicycle and 5 miles becomes just as easy. People lived thousands of years without cars. The problem is our cities are built around cars, and they’re built poorly because of it.
You could easily walk there, yes. But walking back again? With 15kg of groceries? That gets tiresome.
You shop daily or what?
A couple of litres of milk, perhaps ditto soda, some canned goods and frozen items … easily 10 kg. Then add buying in bulk when there’s special offers.
The fact that it feels tiresome is worrying me. That should feel like nothing. 15 kg is not all that much (initially wrote “a joke”, didn’t realize that might sound disrespectful to some), unless you are either 12, 92, or really out of shape.
Have you tried carrying what equates to a toddler by one hand for 3km? Them plastic bag carrying handle bits are going to be digging into your fingers, friend. These days it won’t matter so much of course because the fingers will be frozen anyhow.
Frankly I haven’t used a shopping bag for years because I prefer collapsible cases (approx 40x60 cm) but economically those are even worse to carry farth than, say, 50m.