For organized travelers: half-moon storage bag that perfectly fits the shape of the bag, providing stability and extra space. Ideal for long hikesOur design teams of backpacking enthusiasts have developed these bags to help store and organize your belongings in a Trek 70-90 L backpack.sizes and dimensions of the bagThe bag measures: 15" wide x 12.6" deep x 3.9" high. The unit weight is 2.3 ozCompositionMain fabric : 100.0% Polyester cationic Webbing : 100.0% PolypropyleneMultiple compartments : Set of 2 Half-Moon Bags for 70 to 90 L BackpacksWaterproof : 2000 mm waterproof membrane. NOT WATERPROOF OR WATER-RESISTANTCapacity : The bag measures: L 15" D 12.6" H 3.9". Unit weight: 2.3 oz.Compatibility : fits our Forclaz Trek 700 and Trek 900 range backpacks perfectly