Yeti's Hopper BackFlip 24 blends the Hopper Flip's design into a backpack style that's comfortable and convenient to carry. A removable chest strap and waist belt add stability. Yeti's DryHide Shell is waterproof and resistant to mildew, punctures and UV rays. The HydroLok Zipper and RF-welded seams keep the cold inside. The BackFlip 24 measures 13¾-by-8½-by-19¹⁄8 inches and costs $299.99.