Thunder is atrekking pack with a superb weight to volume/feature ratio. The suspension system is quickly length adjustable and provides excellentfit,torso mobility and weight transfer. Three access options to the main compartment (top, front and side loading) allow simple packing and unpacking. A large front and two side stretch pockets offer additional storage space. A floating lid with inner and outer pocketsand adjustableside compression straps increase carrying capacity forextended trips and expeditions.