The guys at Evike Airsoft checked out the Haley Strategic Flat Pack for you. Check out the product overview at the video below.
Designed with a unique expandable gusset system, the D3 FlatPack is an assault pack that can go from an almost flat profile when compressed to 600 cubic inches when completely expanded. In its compressed state, the D3 FlatPack can run a 1 liter hydration bladder in the main compartment with additional small items like batteries, energy gels and chem lights stored in the dedicated admin chamber. Expanded, the main compartment can fit a fully loaded D3CR™, a helmet or a jacket while the admin can fit electronics and/or small binoculars.
The FlatPack integrates with a D3CR™ or D3CR-H™, replacing the H harness with the pack straps, to create a light reconnaissance, patrol or an EDC worst case scenario rig. The FlatPack will also molle into any PALS based nylon system including plate carriers, assault vests or other packs with external PALs webbing.