PERFECT OUTDOOR GEAR: This lightweight hydration pack is a great companion built for multipurpose activities, with comfortable and breathable adjustable shoulder/chest straps. Best value on Amazon backed by a 100% Money back guarantee with no question. REPLACEABLE 2L BLADDER: Comes with a 2L water bladder, which is made from EVA material and it's BPA-free, designed with an extra-wide diameter of 3.1 inches opening, it's easy for filling or cleaning. MULTIPLE STORAGE COMPARTMENT: The insulated backpack has multiple pockets meet the need to store your various necessities. Whether sweater, cell phone or keys as well, the differently sized pockets will suit all your storage needs perfectly as required. HIGHLY DURABLE & LIGHTWEIGHT: This hydration pack features military-grade durability which will keep the content of your backpack safe while it weights only 1 pound, definitely won't burden you in outdoors. THERMAL INSULATION: Miracol water backpack keeps your fluids cool with the inside thermal layer that lasts up to a duration of 4 hours. This is no doubt the best choice for running, hiking, cycling, biking.