Let these bags loose in the shops when you're let loose in the shops. Rolled up they are the size of a packet of pocket tissues, when let loose in the shops they can hold an Olympic swimming pool of shopping (nearly!) 47cm wide, 44cm high and 7cm deep, 210 denier.
Made from recycled PET bottles. With these bags you are effectively doubling your eco-warrior status in the quest to reduce unwanted plastics in the environment.
Love your planet!