Light Before You Pack It

Half a pound of empty bag is weight you carry for no benefit at all.

Small Overall Volume

A limit on space is the point, since a big bag always ends up full.

Swings Forward for Access

Reaching a pocket without removing the strap is the appeal of a sling.

Holds Shape Half Empty

A soft bag with two items inside sags into an awkward lump on your back.

Slim Against the Body

A flat profile stays out of the way in a queue or on a crowded street.