With 30% more volume than the Synapse 19, the Synapse 25 is an everyday backpack 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 5'6" and 6'6" comfortably