2.75 LITER HYDRATION PACK: Hydration pack backpack with Carabiner Clip. Clean your water backpack, daily, weekly or whenever you want. LIGHTWEIGHT! EASY TO CARRY: If you've been looking for lightweight, compact, and stable insulated hydration packs, then your search is over! That's because our running water backpack has an athletic low-profile design that won’t create a ton of wind resistance or bounce when your running, biking, hiking, or at festivals. The Padded Mesh backing and straps help to keep you cool, comfortable, and dry. LEAK-PROOF & INSULATED: The problem with other hydration backpacks is that water leaks. Unlike others…The ETCBUYS hiking backpack with water bladder solves that problem! Why? That's because our waterproof hydration backpack's bladder features an on/off valve that prevents leaks which means that your water will stay in the bag. PLUS, an easy screw-on cover. EXTRA POCKETS TO CARRY YOUR EXTRA GEAR: This all-weather hydration pack backpack features multiple extra pockets so you can carry your phone, listen to music, or save a snack for later. Need more gear for your trip? Fill with less water and pack with other gear. PREMIUM QUALITY CONSTRUCTION: Made with tactical grade materials our durable water backpack for running contains an integrated water bladder for hiking backpack making and is easy to clean with baking soda or lemon juice. Be Prepared for any outdoor adventure weather with our exciting new hydration pack backpack.