Brand New** Large Capacity: 30 x 11.5 . Structure: Main pocket is a unique duffle-style rollup w/ 2 buckle construction. Best for large items and bulky items. The strap is designed to be widened and thickened, breathable, which effectively reduces shoulder pressure. Suitable for travel,camping,school, and for business. Ergonomics and adjustable padding shoulder straps and sturdy handle offer you comfort carrying for a long time. 100% Waterproof