looks like some people here need some basic life lessons in some not very difficult things.
clothes shopping; take a cloth bag, a suit carrier if you are buying something big or a rucksack that you don't use for food. Put clothes in that. Clothing shopping should be rare anyway except for growing kids; and their clothes can be folded in a shopping bag.
food shopping; take bags with you, either cloth bags or 'bags for life'. Only meat needs wrapping and it comes in wrappings. Fruit and veg should be bought loose if at all possible.
reduce the number of bins in your house. A small one in the bathroom and one in the kitchen is enough, plus a food scraps bin (peelings and teabags only, otherwise you are wasting food) and a place for recycling which is where paper goes. So that's the kitchen bin liner, the bathroom bin liner and that's it.
doesn't seem that difficult to me. Which is probably why my landfill bin is under half-full each fortnight at most.
in short - BUY LESS. USE LESS.
oh, and if you have dog excrement to dispose of, you can afford the dog so you can afford the bags. And do take them home rather than tying them to a tree, eh?