[marcosdumay]

> that I have had for 3-4 years

If you do groceries once a month, you would need 10 years to get into that magic number. That using the same bags every time, if you have more bags than you need, so you alternate their use, it would take more than 10 years.

That said, I usually use plastic bags 2 or 3 times. Does that mean I would have to keep a cotton bag for 20 years? (I do like using reusable bags, but I don't carry them all the time.)

[KozmoNau7]

Once a month seems like a very long cycle. I buy groceries and other commonly needed items 2-4 times per week. Of course, I live within walking/biking distance of several stores, and I hardly ever buy more than what I can fit in a bag.

Still, only once per month seems very little, especially for perishables.

[gambiting]

Once a month seems extremely low. We do one big shop a week, and that's with a lot of planning(we do a massive shop for all dinners and lunches for the entire week) and that's with using long-life milk and freezing bread so that we don't have to go to a shop more often.