When we moved into our apartment, it came with a trash compactor and no place to put a regular trash can. I have been buying the special extra strength compactor bags for it, but with the hot summer weather and needing to take the trash out everyday to discourage ants, I was getting through too many trash bags.
I realized at the weekend after washing the compactor insert that it was the same size as a large kitchen trash bag, so now I have doubled up - I leave one, thick compactor bag in there all the time to keep the insert clean, then line with a standard bag which is cheaper to dispose of every day. I can still use the compacting mode, as the double bagging protects the thinner one from tearing.
I live in LA where most stores no longer provide plastic bags, and the paper ones are 10 cents each, so I need something to take the trash down to the dumpsters in.