plastic 10 to 20 ct
plastic from renewable sources (corn starch and such) free to 10 ct
plastic with polyurethane foam layer (to insulate frozen foods) 30 to 50 ct
fabric, reusable (linen or similar) 50 to 1.00 €
thin and small plastic (chemist's or ethnic food shops) for free
Collapsible plastic baskets: 2,50 to 4 €, at the cashiers or in DIY markets.
All of them are readily available at the conveyor belt at the cashiers, just pick one and add it to your purchased items.
I tend to use my backpack or when going by car I have a collapsible plastic basket but when I walk I try to fold a fabric bag from my home and stick it in the back pocket of my jeans. Once I forget it I feel somewhat sorry for my stupidity of not having thought about it. Then I grab a plastic bag, too (unfortunately).
Reuses:
Plastic and thin plastic: As garbage bags.
Fabric: I have them all around the house to bundle up "loose items" like clothespins, garden clippers, cash receipts and such stuff or I stuff my toothpaste, shaver and comb in them when I am travelling "lightweight".
