Several important considerations when selecting your reusable bags to purchase:1. Durability - Decide if you plan to use them for wet swimsuits at the beach, dirty gym clothes, or a haul from the grocery store. If the first two are your main uses, a tote that can carry 10 pounds will be all you need, however if you're looking to lug heavy gear or cans, bottles and heavy produce, be sure to invest in bags that hold at least 40 pounds each. You don't want seams popping with the price of groceries...