Vibedration Hydration Backpack w/o bladder - Sunflowers - Used。Great for biking, running, hiking lightweight, durable, waterproof Eco-friendly hydration backpacks using recycled polyester (rPET). 8.3 million tons of plastic enters our oceans each year, and we need to act now to stop more plastics going into the oceans. By using recycled materials we together can create a bigger demand for waste collection, especially in developing countries. We consciously designed our Hydration Packs to promote a more sustainable world using a material that has lower carbon footprint, and high performance durability. Leak proof eva 2l (0.5 gallon) water bladder included. Safe alternative EVA plastic is BPA free, 30% lighter and stronger. Bladder pack is easy to remove and clean, UV and stress-crack resistant, and dries faster with low temperature toughness. Space-saving & adjustable. Has enough water and gear capacity, and provides ease of access. Anti-slip padded, cushioned and breathable shoulder straps to get you moving freely. Made for comfort, and perfectly adjustable for all sizes - men, women, , adult youth, teens, kids. You can wear these Hydration Backpacks for hours (or even days)!!