ZipBaby

The ZipBaby is a convertible bag that switches to a beltbag by cinching the strap to your waist size and threading it through your belt loops.  Measuring 8" wide x 6 1/2" tall with two inside pockets and an open space, it really is when you're rolling with just the essentials.  Lots of ecopeeps carry these inside a bigger tote.  Fully extended the strap is about 58" - 60" long and an inch wide.