Bought this brand new from Nathan Sports. Used it on 3 or 4 runs and It's a fantastic pack with TONS of storage and super comfy .. but .. it just doesn't fit my oddly shaped body quite right, so letting it go. Please note, you are buying the vest/pack ONLY. I'm not including the hydration bladder in this because 1) I've used the bladder so that just feels weird to resell, and 2) I'm using the bladder on the new pack that I have purchased. That being said, you can buy a Nathan brand or 3rd party brand (like HydraPak) easily in most running/outdoor stores or online. As always, feel free to reach out with any questions.