Baggu Standard Reusable Bag - Yellow Snakes
Baggu's are the best.
Their best selling reusable bag is not just for the grocery store, it goes everywhere and hauls (practically) anything. Carry in your hand or over your shoulder. Holds 2–3 plastic grocery bags worth of stuff. Folds into a flat 5" × 5" pouch. Holds 50 lbs. Made from 40% recycled nylon sourced from pre-consumer waste.