Reusable grocery bags are ecologically sound and all, but they fold down to the size of a large three-ring binder, which isn’t all that easy keep in your purse. The Joey Tote takes care of this problem — it stores in it’s own built-in pouch, which is roomy enough to hold another tote or two. The machine-washable, rip-stop nylon bags come in two sizes, and are strong enough to hold about 40 pounds worth of stuff (I shoved two gallons of milk into one of the small totes after my last shopping trip with no problems). The large size is just right for slinging over your shoulder, and the small one is about the same size as a standard plastic grocery bag, and as easy to carry, but much more durable. They’re not just for groceries, either: Keep a three-bag set (one large, two small) in your purse and you’ll always have a way to carry your surplus souvenirs when you travel, or to keep the sandy stuff separate after a family trip to the beach.

$8.50 (large), $7 (small), or $20 (for a set of three) at Joeytotes.com.