Come and see our amazing products. This Hydration packs are designed specifically for road cycling /running/ Hiking ,So that's Compact and low-profile so they feel light and stable on your back and won't create a ton of wind resistance ,keep your body functioning at peak performance whether you're training for a marathon or cycling.Hydration backpack has a bike helmet organizer pocket, built-in safety whistle, extra storage pockets, and reflective accents for visibility in low-light environments. a Breathable mesh back panel for a cool & comfortable ride. Pls confirm with us about the packing info, stock color and exact production time before placing your order.