SUPER PADRE Ergonomic Backpack

Tested for back comfort in a 60-chiropractor-wide test of 50 backpacks, and chosen as the best!   Specifications: LARGE:Dimensions: 23"h x 12"w x 9"dFit Range: Adults 5'3" - 6'3"Capacity: 39 litersWeight: 2.5 lbs MEDIUM:Dimensions: 18.5"h x 11.5"w x 9.5"dFit Range: Teens - Adults 5'10"Capacity: 32 litersWeight: 2 lbs SMALL:Dimensions: 16"h x 9.5"w x 8.5"dFit Range: 6yrs-5'2"Capacity: 21 litersWeight: 1.5 lbs XS:Dimensions: 16"h x 9.5"w x 8.5"dFit Range: Ages 5 - 11 yearsCapacity: 18 litersWeight: 1.25 lbs Features: • Unique ergonomic pack for students and day hikers - takes weight of heavy books off shoulders and upper back Comfort Features:• Control straps fine tune load distribution between your shoulders and hips.• Mini internal frame takes the strain of heavy books off your upper back.• Sternum strap distributes the load across the breastplate and pulls the shoulder straps closer together, eliminating under-the-arm pressure.• Shoulder pads have thick, sturdy foam to cushion loa