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  • Low-profile cargo compartments improve balance while a new front stretch pocket makes it easier to grab and stash gear on the go
  • Tough, reinforced fabrics increase durability
  • Upside-down U-zipper main access for easy packing and unloading
  • Front stretch-woven stuff pocket with surface mounted buckle for top compression; dual stretch-mesh side pockets and dual zippered hip belt pockets
  • Rain cover features an external zippered pocket that doubles as accessory storage
  • Trekking pole attachment system with dual-sized loops to accommodate a wide variety of tools and trekking poles
  • Crossover side compression; load control compression
  • Enhanced lumbar foam layering for load-bearing comfort; dynamic yoke integrates the shoulder harness directly to the X Frame structure
  • 3D suspended mesh back panel for superior ventilation; HDPE framesheet with an anti-barreling stay
  • Sewn-in top pocket with zippered security pocket and key clip


View all Gregory Backpacking Packs

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Best Use Backpacking
Frame Type Internal Frame
Gear Capacity (L)
38 liters
40 liters
42 liters
Gear Capacity (cu. in.)
2,318 cubic inches
2,440 cubic inches
2,562 cubic inches
2 lbs. 12 oz. ounces
2 lbs. 15 oz. ounces
3 lbs. 2 oz. ounces
Weight - Metric
1247 grams
1332 grams
1418 grams
Fits Torso
16 - 18 inches
18 - 20 inches
20 - 22 inches
Fits Waist/Hips
27 - 45 inches
28 - 48 inches
30 - 53 inches
Material(s) Body: 210-denier nylon/100-denier nylon; base: 210-denier nylon
Frame Material 4mm spring steel/HDPE
Number of Stays 1
Suspended Mesh Back Panel Yes
Pack Access Top/panel
Number of Exterior Pockets 4 + main compartment
Raincover Included Yes
Dimensions Unavailable
Gender Unisex
Rated 5 out of 5 by from amazingly versatile backpack I bought this pack because of the range of activities I needed to cover with one backpack. The compression straps on this pack beat most things I have seen. this can expand for a few days of backpacking or cragging, or it can compress down for day hikes, and in my case, summer camp work. It is fully featured and padded as well as extremely comfortable. it is just a scaled down version of a top grade backpack. too many great features to list.
Date published: 2016-04-03
Rated 5 out of 5 by from Versatile Bag This bag can do a range of things from short day trips to ultralight extended backpacking. Super comfortable. Suspended back mesh is the best I've seen. Lots of features make it super easy to pack this bag for whatever it is you need
Date published: 2016-05-15
Rated 5 out of 5 by from Well made with great storage options This bag is comfortable and have a lot of options for how to pack your gear. It is rugged and sturdy and very well-made. Another benefit is that it is the perfect size as a carry-on when flying.
Date published: 2016-07-26
Rated 5 out of 5 by from Comfortable and versatile Pros: I've taken this on both long day hikes where I needed to carry a lot of water/warm clothes, as well as 3-day backpacking trips (including carrying a bear canister and a total of 35-40lbs) and it did great for both. When over-full, the frame tends to bend slightly and there is less space for air to flow against your back, but it's not uncomfortable. I've also done a two-day mountain bike trip with it, which is doable but not incredibly comfortable. The waist belt is not structured like you'd find on a larger bag meaning it conforms a lot easier, but still provides ample support (and includes waist band pockets). Shoulder straps are soft and easy to adjust. The air flow system on the frame keeps your back cool and eliminates rub. The pack has excellent compression straps that make it comfortable both empty and full. It's also very light so it doesn't feel excessive carrying it for day hikes. Cons: Not many "little pockets" or outside equipment loops - all your small stuff has to go in the brain of the pack. Outside center pocket (lighter color in the picture) must be closed with a strap that goes over the drawstring opening to the main pocket. If the outside pocket is closed, it's hard to get in the main pocket. Brain doesn't have tightening/loosening straps on both front and rear and is not removable, so it can only expand so far to hold extra stuff. Despite the cons, I haven't found a pack that has this combination of comfort and versatility, so I give it 5 stars.
Date published: 2016-09-28
Rated 5 out of 5 by from Great Bag, my "go to" pack. I bought this last fall and have day hiked with it a few dozen times. I was looking for the style that lets your back breath somewhat and I'm skeptical of all of them but this one is pretty darn good. I'm definitely surprised to the upside with how well it fits and lets air go across my back. I have to echo all the 5 star comments I've read, all good and valid input. Some people are really picky about pockets and I guess they ought to have done what I did: go to REI and look at it first, and take advantage of the fact that you can load it with sand bags and walk around the store for a while to test the fit. This thing fits me so much better than any other pack I've used. One thing: if you're hiking solo use a bladder because fetching a water bottle from the side pockets while it's on your back is pretty much impossible. However, this bags ability to disappear on my back negates any other negatives. I generally hike with 10-25 lbs on my back and in 45-85 degree weather, would call myself a moderate hiker, 5'10" 185 lbs. Pay attention to the sizes of the pack, take advantage of the ability to test it out in the store. Happy trails.
Date published: 2017-04-02
Rated 2 out of 5 by from Nice size bag, horrible pockets I purchased the bag to for a backpacking trip out to Shawnee National Forest. It held all my gear with plenty of extra space for a few nonessentials and it supported the 25lbs (including food and water) the way I'd hope from a pack in this price range. I was satisfied. Until I got it out in the field, that is. The front U-shaped zip access is great in theory, but in practice it is more of a hassle than it needs to be. There is a stretch mesh pocket located on the front of that pack which is only held closed by a clip connected to the top of the pack under the brain. In order to open the front access U-shaped zip, you must unclip the stretch mesh pocket, which then empties itself of it's contents as you flip the front access U-shaped zip open. It's a pain in the butt to have to reload that pocket every time, especially if it was holding your food and you don't care to lose any of it. The next issue I found was with the stretch mesh pockets on the sides of the pack. They initially seemed great and were able to hold a 32oz bottle on one side, plus a hatchet and trowel on the other, even with my sleeping bag stuffed down into the bottom of the main compartment. However, after only one weekend off use, the pocket which was holding my round water bottle now has a whole in it. I don't think it's from the bottle stretching the mesh out, as I didn't have to force the bottle into the pocket, but rather I think the pockets could not withstand the abuse of trekking through thick brush and scrambling over and through boulders, or climbing down bluffs. My wife has a similar Gregory bag with the same pockets, and hers also have holes in them after our trip. We purchased the packs at the same time. For $180, I'd think the pockets might last longer than two days.
Date published: 2016-08-29
Rated 4 out of 5 by from Comfortable fit. Very adjustable to fit every use Was able to go on long day hikes. Comfortable abs stable.
Date published: 2017-06-04
Rated 4 out of 5 by from Perfect fit Very well designed. Very comfortable and plenty of room.
Date published: 2017-03-09
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Does anyone know how this pack fits a woman? Trying to size for a 5'3" 120 pound woman. Would a small work, or would it still be too big?

Asked by: bbright
I'm a female, a little under 5'2 and 105 lbs. and the Medium is great. It adjusts nicely for different loads and is a great all-around small pack.
Answered by: AMR
Date published: 2017-06-06

What is the length of the frame on the Large size of this pack? I am curious if it will fit as a carry-on if not packed full. 

Asked by: sbj2000
​The frame on a size large measures 24 inches tall.
Answered by: REIservice
Date published: 2017-06-06

Does this have a removable top or a day pack?

Asked by: Jarad
The top lid of the Zulu 40 Pack is sewn in and cannot be removed. A daypack is not included with the pack.
Answered by: REIservice
Date published: 2016-05-18

Does the top lid/brain count as part of the 40L capacity, or is that additional capacity on top of a 40L main compartment?

Asked by: Bicycle Billy
The overall volume of this pack is 40 liters (38 liters for the small, 42 liters for the large), which includes the attached pack lid.
Answered by: REIservice
Date published: 2017-06-06

My torso length is 50 centimeters,which size should i take?

Asked by: NoamG
50 cm converts to 19.7 inches. We recommend a size medium Zulu 40 for this torso length.
Answered by: REIservice
Date published: 2017-06-17

Do you guys sell this pack in the Feldspar gray? If not, can you guys order it from gregory?

Asked by: George Wa
​As of December 2016, we are not carrying the Feldspar Grey color and are unable to special order it directly from Gregory.
Answered by: REIservice
Date published: 2016-12-12

hi, does zulu 40 has the same removal daypack for hyrdration like the 55? Thanks

Asked by: raphy
This pack does not have a removable daypack.
Answered by: REIservice
Date published: 2017-02-08

Where would you attach the sleeping bag or is this not the right application for two or three day hikes?

Asked by: Neal
This pack does not have a sleeping bag compartment or straps that can be easily used for carrying a sleeping bag. Sleeping bags are best packed in the main compartment.
Answered by: REIservice
Date published: 2017-06-16
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