Baggallini
I found these great products at a bookstore. One is a phone case with a pocket for money and your ID and the other is a bag that folds back into its own pouch.
Here are the specifics of each:
Flip Phone Case:
*light weight, water resistant nylon
*wear it over your shoulder, around your waist or clip it to another bag
*zippered compartment for credit cards, ID, money, keys and lipstick
*belt clip, 3" strap and detachable, adjustable 52" strap
*3" x 4.5" x 2"
*weighs 4 ounces
Bag:
*made of lightweight, durable, water-resistant 70D ripstop nylon with PVC backing for extra durability
*easily folds back into its own 5 1/2" x 4 1/2" pouch
*zips open to a 15"T x 18"W x 6"D shopping bag with zippered top
*weighs 8 oz
The Baggallini was the perfect bag for taking on the airplane. When our luggage was 2 pounds overweight, I pulled it out and stuffed some stuff in it to avoid the crazy $150 overweight charge.