The Synapse 19 is the supreme backpack for everyday carry, ultralight travel, or a day hike. The original of the Syn- backpacks, the Synapse 19 was designed with ultimate utility in mind: Main compartment with 2 O-rings Interior, banded open-top pocket 5 exterior front pockets with independent volume Comfortable, durable, edgeless shoulder straps Breathable back panel Removable sternum strap and waist strap Webbing loop on exterior bottom of bag to hook items on the outside Meets the personal item size requirement on most airlines Generally fits folks between 5' and 5'10" comfortably For a larger version, check out the Synapse 25.