How to Choose Daypacks
Bend, Oregon
Gregory Inertia 18 H2O Hydration Pack - 2024 - Men's
This product is not available. Good news: we have a newer version.
Whether traveling or trekking, the Gregory Inertia 18 H2O hydration pack transitions from trail to transit with its zippered pockets and a reservoir compartment that converts to a small laptop sleeve.
Shop newer version
- 3D foam on the surface of the back panel creates space for airflow when you're wearing the pack; multilayer construction adds breathable support
- Included 2-liter 3D Hydro reservoir with a patented 3D molded design works like a reservoir and dries like a water bottle
- Zippered hydration sleeve features a SpeedClip hydration hanger for single-handed, snap-and-go connection; hydration compartment can double as a sleeve for electronic devices
- Perforated shoulder harness provides a comfortable carry; magnetic sternum buckle and hose clip hold the Drylock bite valve on the shoulder harness for easy access to H2O
- Inline hose quick-disconnect coupling allows for easy refills without having to unthread the hose from the shoulder harness
- Removable webbing hipbelt offers additional support
- Top zippered quick-access pocket with key clip; side zippered pocket; side mesh water bottle pocket
- Reflective attachment loops; adjustable trekking pole attachment system
- Custom ComfortGrip molded zipper pulls
- Gregory offers a lifetime guarantee on this product
Imported.
View all Gregory Daypacks| Best Use | Hiking |
|---|---|
| Frame Type | Frameless |
| Gear Capacity (L) | 18 liters |
| Gear Capacity (cu. in.) | 1,098 cubic inches |
| Reservoir Compatible | Yes |
| Reservoir Included | Yes |
| Bottle(s) Included | None |
| Liquid Capacity (L) | 2 liters |
| Liquid Capacity (fl. oz.) | 64 fluid ounces |
| Weight | 1 lb. 3.5 oz. |
| Fits Torso Length (in.) | 16-21 inches |
| Fits Waist/Hips | 28-48 inches |
| Material(s) | Nylon |
| Pack Access | Panel |
| Number of Exterior Pockets | 3 + main compartment |
| Hipbelt | Yes |
| Bite Valve Shut-off Switch | Yes |
| Raincover Included | No |
| Dimensions | 19 x 10 x 8 inches |
| Gender | Men's |
| Sustainability | Contains recycled materials |
Buying Advice
More expert advice
Review this Product
Adding a review will require a valid email for verification
Customer Images
Angelicious
Portugal
Would love it, if…
2 years ago
I like the fact that this pack has three outer mesh pockets, one 3L water reservoir compartment including hose routing straps, and a comfy breathable meshed back support plus shoulder straps. I WOULD LOVE this pack if it had one additional inner pocket for keeping valuable electronics and wallet away from easy reach and thieves. I WOULD ALSO LOVE this pack if it had a single-handed, quick-pull draw cord with a weather flap seal in order to access the MAIN COMPARTMENT without the use of a cumbersome zipper, which slows me down when in outdoor conditions. Other than that, this pack is beautifully made.
No, I do not recommend this product
Originally posted on Gregory
Neil S
Perfect day trip pack
1 year ago
I love this pack for day trips, both hiking and snowshoe. The bladder is easy to access, fill, and secure. The main compartment has sufficient space for a first aid kit, food, wind/water proof shell with room to spare. I only wish that it had a better means to secure snow shoes for hikes where they are not initially needed.
Originally posted on ExpertVoice.com
TheAdventureDispatch
Phoenix AZ
Absolutely Perfect Bag for Day Hikes + Hydration
3 years ago
[This review was collected as part of a promotion.] I did receive this pack as a #giftedproduct, but that in no way influences my review or remarks. I have been a huge fan of Gregory for years. I use their bags for backpacking, day hikes, and commuting. Their bags are top-notch quality, feature-rich and comfortable. The Inertia 18 is no exception. Why do I love it? The small footprint gives way to a massive amount of capacity without feeling too bulgy. The bag itself has a shape that it doesn't lose when empty - making it easy to pack up, sort through, and clean up. It's got all the bells and whistles that can be jammed into a small package: Amply sized main storage compartment, a separate hydration pocket, a front knickknack pocket at the top, a mesh water bottle side pocket, and a bonus zip pocket on the other side. The back panel mesh on the back allows pretty good airflow, and the straps are nice and lightweight so they don't feel too bulky or heavy - even when the sweat hits. But the gem: The hydration system. Gregory absolutely killed the game with their hydration systems - hands-down best on the market. This bag comes with a 2L bladder which is the perfect size for most hikes that I do. On hot days, I will throw an iced-down water bottle in the side pocket. (I Live in AZ). The bladder has a quick release system meaning you can completely pull it out to fill it up. So easy and clean. It has a wide mouth to make filling simple. There is a handle to help carry the bladder outside of the bag. The lid twists on and off with ease and is very secure - which is where many other brands go amiss. The INertia's hydration compartment has a built-in hook to hang the bag from so it doesn't slump around, and because of the hardened back panel of the bladder, it stays in place - and keeps that water upright and ready to flow. It's also the simplest water hydration system to clean. Gregory integrated a hook for you to be able to hang the bladder upside down. I usually throw a paper towel or small towel in the bottom to soak up any water, making sure to keep the mouth open for airflow while the bladder dries itself out.
Originally posted on Gregory
Aaron W
Awesome Day Pack
1 year ago
This is a fantastic and comfortable day pack. I have used it on a few hikes and it has been awesome. The mesh panel helps with breathability, but if you run hot you’ll still sweat with this pack. I love the separate hydration sleeve and the clip that keeps the hydration pack steady. The hydration pack it comes with is amazing and easy to clean. The only think that could make it better would be a rain cover to go with the pack.
Originally posted on ExpertVoice.com
Richard H
San Juan Mountains
Perfect size/weight for day hikes
3 months ago
I got this pack to replace an older 3L Camelbak with an internal/plastic frame, which was getting heavy as I got older (funny how that happens). This Gregory Inertia is perfect size/weight for day hikes, and is so much lighter.
Age:55–64
Yes , I recommend this product
MikeK
California
perfect fit
1 year ago
Perfect fit for me (6’ tall 185lb). Appropriate size for day hike. So comfortable with it back
Age:45–54
Yes , I recommend this product
Mark S
Outstanding Quality
2 years ago
This H2O backpack is awesome in every aspect. Quality materials, great fit and many options.
Originally posted on ExpertVoice.com
Anonymous
11 months ago
Jason S
2 years ago
Originally posted on ExpertVoice.com
Anonymous
2 years ago
Originally posted on Gregory
1 - 10 of 11 Reviews