Square shape fits and stacks great in your pack * Zippered opening allows faster access and security when closed * Large haul loops for grabbing and hanging * Assorted colors for color coding your gear * 8L: 4.3oz 11 x 7 x 6"; 12L: 5oz 13 x 8 x 7"; 18L: 5.4oz 15 x 9 x 8"; 25L: 6.4oz 17x 10 x 9"