SPGOOD Bike Backpack 20L/25L/30L Waterproof Breathable for Men and Women with Rain Cover Helmet Motorcycle Sports Cycling Hiking Camping MTB

【Large Capacity】 - Main compartment + front compartment = 20L/25L/30L; Made of waterproof and tear resistant nylon, which is sturdy, durable and ultra-lightweight. 【Breathable and comfortable】 – The back panel features a mesh coating over EVA foam to promote air circulation. The shoulder straps are specially padded and covered with mesh to reduce pressure and ensure optimal comfort. 【Adjustable】 – Adjustable shoulder, chest and waist straps for increased stability of the mountain bike backpack. 【Upgraded Design】 - Compatible with hydration systems; a concealed opening for the hydration hose is built into the shoulder strap (water bladder not included), allowing you to drink while riding. The bag also includes front, side and phone pockets, as well as a rain cover and helmet net - a multifunctional design to meet all your needs.