Kiva Designs Kiva Convertibles Sling 'n Tote

"Our convertible slings measure only 8"" X 3"" X 9"" when tucked away in their own ergonomic shape that hugs the natural contours of the body when worn messenger style with the mono, adjustable shoulder strap The zip down front pocket has plenty of room when they're folded up and when you need to carry a larger load they unfold to large capacity bags that can carry an amazing amount"

$29.95 from Luggagepoint.com