AmeriBag Vortex Lumbar Back. Sore backs are a thing of the past. AmeriBag Vortex Lumbar Back. Sore backs are a thing of the past. Special ergonomic design redistributes the weight of the Pack to reduce stress on the shoulders, neck, and back! Great for the action-ready individual, especially so for bikers and hikers.Adventuresome Pack features rugged high-tenacity nylon construction-tough enough to take a few bumps and scrapes-and plenty of pockets for wallet, keys, valuables, and more. Don't lumber around with a giant, unwieldy pack... strap on the Vortex Lumbar and kiss your sore back goodbye.Made from high-tenacity 420D nylon, with 800D nylon for reinforcement the outer shell is more than a match for heavy useAdjustable padded lumbar straps for a comfortable fit Mesh water bottle pocket on the side Detachable shoulder strap included Measures 9 3/4 x 10 x 6 wide. Weighs 2 lbs. State Color, as available in the Shopping Cart. Color: Lime Green. Gender: Unisex. Material: Nylon.