Collect reusable bags.
When you have a bunch of reusable bags at your place, then you can bring it with you when you buy your groceries.
There are certain grocery stores these days, which can offer you discounts, tokens. or coupons, if you are going to being your own bag for your purchased goods.
By doing that, you won’t just he saving money, hut you could also he saving the world by using lesser plastic bags.