Purchased at a Montbell store two months ago and only used once, so I no longer need it. Retail price: 5,200 yen Specifications: Material: Stretch mesh Back: 3D mesh Bottle section: 210-denier nylon ripstop [urethane coating] Weight: 134g Color: Black (BK) Size: Smartphone pocket size: Height 17cm x Width 8cm Features: Adjustable diameter bottle holder, mesh pocket to prevent items from shaking, a pocket with a fold-over flap suitable for holding smartphones, etc., 3D mesh for excellent breathability, reflective logo Compatible waist size: Up to 105cm I think it will be helpful for hydration during walking or running.