This 18×13×6.3-inch waterproof duffel (Model T1112) meets Spirit/Frontier Airlines' personal item size, saving carry-on fees while offering 25L capacity at just 7.2oz. Featuring 45lb-weight-bearing straps and a luggage sleeve for suitcase attachment, it folds compactly and includes quick-access pockets - perfect for gym essentials or as an ultra-light travel companion.