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Gregory Endo 15

photo: Gregory Endo 15 hydration pack

Gregory's new Endo 15 offers a feature-rich hydration pack with their latest technology and famed reliability. The Endo 15 is not limited to one activity, but useful for all you can dream up!


  • Renown Gregory durability
  • Comfortable and form-fitting
  • Feature-rich
  • Trim and unobtrusive
  • Multi-use


  • I prefer larger hipbelt pockets
  • I would prefer a few inches more on the hydration hose


Gregory Endo 15 Mountain Bike Hydration Pack


  • Superb hydration bladder
  • Multiple storage compartments
  • Padded zippered pocket
  • Dual zippered hip-belt pouches
  • Magnetic sternum strap clip
  • Separate, removable tool kit bag
  • Flasher attachment


  • Hydration hose tad short for sternum magnet
  • Hip belt pockets need to fit current smartphones in common protective cases


What a great hydration pack! I’m going to suggest it’s a perfect all-arounder for its capacity, comfort, and secure fit. As a member of another website, I was given this product in exchange for a review.

At 15 liters, I fit an abundance of necessity and unnecessary items for a day hike or ride.

Gregory’s main objective was to make a superior mountain biking hydration pack…and they have. But the Endo 15 offers much more versatility. While I haven’t climbed with it yet, it’s sleek design and clutter free frontage prevents snagging or getting in one’s way. I’ve put over a couple hundred trail miles since receiving this pack…and I’m appreciating it more each mile.

Once you don the Endo 15 and adjust the straps, it molds to your back with no movement. Whether cranking out the miles in the saddle or hoofin’ on foot, the Gregory stays put! No side swaying and little upward bouncing. So no worries of losing concentration on the technicals due to annoying pack shifting.


The Gregory Endo 15 materials are as durable and robust as its larger kin.


  • Molded Zipper Pulls—No more frustration searching and fumbling for zipper pulls. The Endo 15 has convenient plastic molded zipper pulls attached to each zipper with durable cordage…permitting easy finger pass-through for a positive grip.
  • Belt KeepersOne often overlooked feature is the “strap keeper slides”. I don’t like dangling strap ends, so this feature cleans that all up and keeps them out of the way. It’s the small things in life.

  • RS SuspensionThe Endo 15 with RS (Ride Stability) allows adjustments for near perfect fit and suspension for various torso lengths and users preference. Detachable hook and loop gives you the option to move the pack higher or lower on your back.

  • Eyewear RetentionThe left shoulder strap has a loop to slide your eyewear stem through and a shockcord loop to pull over and secure around the nose bridge. Sunglasses don’t budge.

  • Crash PadPadded interior pocket. Printed symbol suggests eyewear or small electronics (such as smartphones) and is padded 360 degrees. Note: a second, small exterior zippered pocket is partially padded, as it shares the rear pad from the Crash Pad that separates the two pockets.

  • Dual Hip Belt Zippered PocketsBoth non-adjustable pockets are moved rearward toward the pack body, away from the gigline. This prevents impingement or discomfort when leaned over the handlebars.

  • Removable Tool Pouch—An excellent idea! A zippered bi-fold tool pouch that has two inner zippered pockets, one fabric covered and one see-thru mesh. This tool pouch slides neatly into it’s own center mesh pocket inside the pack, with two narrower mesh pockets on either side which I slide a mini pump in one and CO2 inflator in the other.
  • Exterior Breathable Stretch Pocket—A large stuff pocket allows for a windbreaker or rain jacket to be quickly stuffed. I learned to appreciate this same feature on my Gregory Paragon 58 while backpacking.

  • Bi-lateral Lashing TabsDual web lashing points allow helmet straps to be run through and held securely…or whatever other item one would desire to lash securely to the outside of the pack.
  • Reflective DecalsCyclists of any kind can never have too much reflective material. Gregory’s use of reflective decals is stylish and subdued.
  • Flasher TabAny cycling pack worth its salt will possess an attachment point for an illumination flasher. I tried several different brands and all fit effectively.

  • Compression StrapsTwo upper compression straps snug up contents tightly.
  • Magnetic Sternum Strap ButtonA small magnet integrated in the sternum strap attachment secures the hydration hose. Initially I was suspect of how strong this magnetic union would be. It remained attached, even when motorcycling at 70 mph…impressive.

  • EVAP Back PanelMoisture wicking material, along with its tautness, keeps the pack body off your back and permits ample airflow.
  • 3D Hydro Hydration Reservoirutilizes a proprietary QuickDry soft molded technology, has an integrated hanger located at the base of the hydration tube, is a full 3 liters, and best of all…is included with the pack! The pack uses a speed-clip to attach the reservoir to the pack, rather than a hook-n-loop tab or hook. This prevents the reservoir from sliding down into its separate sleeve.

Changes I’d like to see:

  • A longer hydration hose. I am a fairly average athletic build, but I found when hooked into the plastic clip on the shoulder strip, I really had to pull on the hose to get the hose and sternum magnets to mate.
  • A little larger hipbelt pockets. Neither my iPhone 7 in a Pelican Marine case nor in an Otter case would fit.

Final Thoughts: I endeavored to put Gregory’s Endo 15 through its paces over several hundred miles...while hiking, scrambling, cycling on road and trail, and motorcycling. I am extremely impressed with how breathable, yet form fitting the Endo is to the body…as well as how much I can bring along. It’s my everyday favorite and I highly recommend it. Thankfully, No Endos were performed during testing.

Source: tested or reviewed it for the manufacturer (I kept the product after testing.)

The author of this review received the product from the brand or its representatives in exchange for a review.

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Price Current Retail: $119.96-$159.95
Historic Range: $97.93-$159.95
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