45 denier polyester with TPU laminate makes this pack highly water-resistant and very durable. TPU finish gives a high gloss patent leather appearance. Bottom entry wetsuit compartment has heat sealed seams making it waterproof. TSA approved size for check-in luggage (simply pull out the helmet prior to placing in overhead storage). The pack has a volume of 4000 cubic inches including the expanding helmet holder. Height=22 inches, Average Depth=13 inches, Width=14 inches. | Large top-loading main compartment overtakes the entire space of all compartments if you want a duffel-style pack. Exterior helmet holder, with quick open for removal. Light-color interior for easy viewing of what is inside and to eliminate the "Black Hole" effect. Black has grey/white interior, Cyan has cyan/grey/white interior, White has black/grey/white interior. All have black wetsuit compartment. Vertical Mid-Bellyô zipper for easy access to items at the bottom of the pack. | Inverted nylon zippers create a streamline appearance and ensure smoother operation. Zipper pulls made of round nylon mountaineering cord for durability. Interior case made of soft-plush fabric for sunglasses or swim goggles. Inside pocket against the back holds a hydration bladder (not included). Exterior pop-out pocket hold 32 ounce drink bottle. Mesh water bottle holder fits a liter-size bottle. Waist strap with a durable nylon buckle makes carrying the pack more comfortable. | Ergonomic shoulder straps made out of high density foam for improved comfort when pack is full. Vertical daisy chain on outside to attach straps for carrying additional items like floor pump, towel, yoga mattress, shoes, fleece or down jacket. Breathable foam padding against back offers comfort and insulation. 2 D-ring straps included. Waist strap with a durable nylon buckle makes carrying the pack more comfortable. Large exterior zippered mesh pocket. | Don't lose your keys again! - Interior key ring loop inside the large exterior mesh pocket.