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Endo 15L Hydration Backpack

4.65 out of 5 stars
20 Reviews
Color:Carbon Black


Size Chart


Endo 15L Hydration Backpack

Clean, compact, and built with all the features for a successful day on the trails, the Gregory Endo 15 Hydration Backpack boasts thoughtful organization for your tools, tubes, pumps, and extra layers, as well as a Shift RS (Ride Stability) suspension system that eliminates irritating jostling when riding at speed. This RS system lets you adjust the hipbelt vertically to sit either higher or lower on your back for an exact fit and bounce-free stability. 

EVAP moisture-wicking tech in the backpanel and shoulder straps serve up cool, breathable comfort through warm temps and intense rides. Gregory made access to water a priority by including a 3D Hydro reservoir, which uses soft-molded QuickDry technology for an anatomical fit on your back, and comes ready with a DryLock bite valve for easy sipping. Molded webbing keepers hush the flapping of your straps by storing them out of sight, and a safety light lash helps keep you visible when night riding. Multiple zippered pockets—one of which uses protective foam to defend against impact and weather—safely carry all of your mountain bike essentials through the entire ride.


  • Bike-ready hydration pack designed for all day on the trails
  • Adjustable suspension system customizes a bounce-free fit
  • Breathable shoulder straps wick sweat and keep you cool
  • Durable fabrics hold up through rough wear and tear
  • Magnetic sternum strap adjusts with one hand
  • Hydration reservoir is included to keep water close by
  • Multiple pockets safely stash all your riding gear
  • Item #GRE009V
65% polyester, 35% nylon
15L (915cu in)
Shift RS Vent Hydro
Shoulder Straps
Waist Belt
Hydration Compatible
Reservoir Included
yes, 3D Hydro
1 Crash Pad Protection, 1 quick-access, 2 hipbelt zippered, 1 stretch mesh
Weight Capacity
19.3 x 9 x 7.9in
Claimed Weight
Manufacturer Warranty
limited lifetime

Overall Rating

4.5 based on 20 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 1 reviews
4 Stars - 5 reviews
5 Stars - 14 reviews

What do you think about this product?


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5 out of 5 stars

May 27, 2024

It’s the perfect size for any day trip hiking, climbing, or cycling.

Dennis H

Originally reviewed on

5 out of 5 stars

December 28, 2023

Perfect hydration pack for mountain biking

My experience with the Gregory Endo 15 H20 for mountain biking has been excellent. The pockets are well thought out, the hydration pack sloshes a lot less than others, and does not create any weird chemical taste as some other hydration packs have.

Brendan D

Originally reviewed on

5 out of 5 stars

July 21, 2023

good bike pack

lightweight, comfortable, plenty of storage for a longer ride including bikepacking (with the usual assortment of bicycle packs), wish the hip belt pockets were larger though


Originally reviewed on Gregory

3 out of 5 stars

May 17, 2023

Nice Bag/Pockets rip

I love the bag - nice number of pockets and zippers. Fits really nicely on me. But I am bummed that the inner pockets have already torn. Material on inside pockets very thin. Used for hiking and day trips to the beach/river. It's lightweight which is also great.

Cathy M

Originally reviewed on

5 out of 5 stars

April 27, 2023

Pretty stoked on this bag. Even with its 3L reservoir full and the bag full of kit for a long day the pack remains very, very comfortable. Moreover, breathability is pretty good. No complaints so far. There are obviously more minimal options out there, but the pack does such a good job distributing weight I prefer it to other hydration solutions I've tried.

Nicholas F

Originally reviewed on

5 out of 5 stars

January 24, 2023

Well designed aqua pack.

Love the suspension system. Very comfortable. Roomy- handles all my gear for a day on the trails. Like it way better than the Camelback I previously had. I’d say it’s about the same quality as my Osprey.

Lori S

Originally reviewed on

5 out of 5 stars

July 17, 2022

Great bike backpack!

Excellent ventilation, and plenty of storage space, with enough space to store everything you need! I wish the blader had a slide top to make cleaning easier, but I already had a blader I wanted to use with it anyway, so that didn't bother me.

Kosta K

Originally reviewed on

4 out of 5 stars

July 17, 2022

Gregory Endo long-term review

I’ve been using this backpack for 6 months for mountain biking mostly and hiking occasionally. The backpack is lightweight, but it’s made with a tough material. The back mesh-panel keeps a steady air flow during a ride preventing my tshirt from getting soaked. The internal pockets are great for organizing snacks, tools, and keys. My favorite things are the hip pockets and the sunglasses cord. One thing that could get better was the hose. It’s not that long, and it kept unattached itself from the magnetic clip. I had to buy the extension kit. Overall, I have made a good decision purchasing Gregory Endo!

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Andre O

Originally reviewed on

5 out of 5 stars

July 17, 2022

Great MTB pack

This pack is a great size for short to medium-length rides in any terrain. Its many pockets and dedicated tool pouch are awesome for keeping things organized. I've also used this bag for nordic skiing, where it works equally well. The strap adjustments work well. The only thing that I would improve upon is the magnet-secured water hose, which sometimes falls down in rough terrain. Other than that, this is an excellent pack.

Jeffrey W

Originally reviewed on

5 out of 5 stars

July 17, 2022

Small but Spacious-Convenient and Comfortable!

Admittedly, I am a Gregory fan, owning numerous models for varied applications. The Endo 15 is a perfect MTB/Gravel grinding size, fitting everything I need and then some for short and extended daily forays. I have no complaints and have even “endo’d” while wearing it...without damage to the pack. I did have a bug repellent bottle leak which degraded the waterproof coating on the inside...mental lapse. It is my daily use pack for all excursions and if I don’t keep it close my daughter snags it.

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Dave V

Originally reviewed on