Abstract: A backpack system is provided including an external frame, a pack bag and a sling configured for extending between the frame and pack bag providing a space between the frame and pack bag for accommodating heavy or bulky cargo therebetween. The sling can be extended or retracted in order to selectively adjust the distance between the pack bag and frame. The backpack system may also include a pouch for supporting a lower end of relatively long object therein, which may be carried in the space between the pack bag and frame. In one embodiment, the pack bag is equipped with stiffening members for supporting the pack bag when not mounted directly to the frame.

Abstract: The present invention involves the provision of a backpack frame assembly and associated load carrying devices. The backpack frame includes a plurality of stays having flexible joints therebetween. A membrane is secured to certain of the stays and helps resist flexing of joints between adjacent stay end portions. Load carrying devices may be provided and are releasably mounted to the frame assembly. The distance between the assembly's shoulder straps and hip belt can be adjusted to accommodate user's having different torso lengths by using an adjuster sheet to separate hook and look members attaching a shoulder strap assembly to a frame assembly. The adjuster sheet can operate as a support element when not operating as an adjuster. The adjuster sheet can be constructed of a laminated composite material and include reinforcing ribs formed therein.