The Backpacker First Aid Kit from Atwater Carey is lightweight and compact.
The Atwater Carey Backpacker 1st aid kit weighs just 10.2 oz. and contains the minimum required supplies for treating field injuries and stopping bleeding. The kit comes packed in a zippered nylon pouch with sewn-in belt straps. The two zippered inner clear plastic pockets help keep your supplies organized while providing visibility to contents.
This first aid kit even comes with a handy 120 page field guide, "Backcountry First Aid and Extended Care" by Buck Tilton.
Atwater Carey part number: 371054