Whether you've made your own sacks from recycled t-shirts or purchased totes that support a good cause, the reusable bag is a shopping must have. Amassing a collection of eco-friendly bags is the easy part--remembering to bring them every time you go to the store can be tricky. Be prepared for spur-of-the-moment sprees by storing extra canvas or hemp bags in your bike basket, office cubicle, and the trunk of your car. Stash a small reusable produce bag in your purse or briefcase so that if you decide to swing by the farmer's market on your lunch hour, you won't have to juggle your fruit to avoid the ol' plastic bag.Source: The Sierra Club's The Green Life