At Amazon, add this Everfun 18L Hydration Backpack to your cart to drop the price to $33 at checkout. It's the best price we could find by $20.
The insulated bladder compartment fits up to a 3L bladder, and a 2L bladder is included. Shipping is free.
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Features 18L main compartment with 8 pockets Includes a 2L (70-oz.) water bladder in an insulated compartment Built-in rain cover & reflective strips Padded, ventilated shoulder straps with chest clip & whistle