JBL Travel Heavy Duty Backpack for Spearfishing and Free Diving Butterfly Pockets hold mask, gloves and other gear while acting as a cinch strap for binding spear gun and fins secure to the body Constructed of rugged cordura with a tarpaulin grommeted bottom Inner sleeve for hydration pouch, iPod pocket and polymer carrying handle Foam molded back piece and ergonomically enhanced shoulder straps provide unbelievable comfort and weight displacement