Come and see our amazing products. The Hydration pack have thick insulated layer ,the insulated bladder compartment keeps your liquid cool or hot for up to 4 hours.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.The 2L liner inside detaches from the backpack for easy cleaning and assembly. The rubber mouthpiece has a simple switch valve to stop water flow when needed, ensuring a leak free outdoor experience. Adjustable straps help tailor the hydration pack to your needs. Pls confirm with us about the packing info, stock color and exact production time before placing your order