The Flex Can Be Whatever You Want It To Be. The Adjustable Suspension And Waist Belt Secure Around Most Torso And Waist Sizes For a totally customizable Fit. Three Storage compartments Are Just a Reach Away, And Four Compression straps Can Handle Additional Gear. This Compact Pack features 650 Cubic inches Of Storage And Three Interior Organizational compartments. Yet With a Weight Of Just Over 1.5 pounds, You May Not Even Realize You're Wearing It.