[scotty79]

> If this logic is correct

It is not.

If canvas bag costs 7000 plastic bags then you have to use it 7000 thousand times like you would use a plastic bag to get the same impact. It doesn't matter how often you use it.

If you divide 7000 by 50 you are just saying you have to use canvas bag like you used 50 canvas bags, 140 times. Since you got 5 years of groceries out of those 50 bags you'd need 5*140 years to get 140 as much of utility out of canvas bag.

[dredmorbius]

The question is what the all-in costs are. Specifically, manufacture is not the. full lifecycle, and plastic persists in the environment for decades, if not millennia.

Alternatives which balance modest production costs, greater ruse, and biodegrade more quickly, can come out on top.

[scotty79]

Many multiple use bags are thick plastick or have thick plastic inner lining. They have less plastic than 7000 "single use" plastic bags but they don't have 0.

I hope we won't let most of our trash to persist in the environment for millenia.