Gregory Z40

3 reviews
5-star:   2
4-star:   1
3-star:   0
2-star:   0
1-star:   0


medium large
Weight 3 lb 4 oz / 1.50 kg 3 lb 7 oz / 1.55 kg
Capacity 2441 cu in / 40 L 2563 cu in / 42 L
Torso length 18 in - <20 in 20 in - 22 in



I love this pack! I was looking for a pack that could…

Rating: rated 5 of 5 stars
Price Paid: $120

I love this pack! I was looking for a pack that could get small enough for a day pack but also get big enough to hold my gear for an overnighter. It did the job. The crossflow system provides excellent air flow to avoid the sweaty back.  

Without a rainfly it did well in wet conditions but not in a downpour. That's why I'm glad they added the rainfly. I also like how they added the sleeping back compartment in the bottom.

Overall this is an amazing pack!


It's not the lightest pack of this size, but it is…

Rating: rated 4 of 5 stars
Source: bought it new
Price Paid: $140


It's not the lightest pack of this size, but it is very comfortable so far, and seems very durable.


  • Very comfortable
  • Packs down nice when empty
  • Very durable
  • Includes rain cover
  • Breathable back
  • Reasonable weight


  • Tiny waistbelt pockets
  • very small "sleeping bag compartment"

I like this pack. I do a lot of hiking where there isn't always a trail, and this pack hugs my body very well while still providing air flow to most of my back. It's a very stream-lined, snug fitting design. Almost too small for a multiday pack (unless your a minimalist), and a little excessive for a day pack (unless you're very comfort driven).

I CAN fit all of my long distance hiking gear in it, but the Z45 or Z50 would probably be a little more ideal for carrying larger amounts of food, water or clothes. Again, if you're a minimalist or have the most compact gear you can get, this should be fine. My bag weighs 21 lbs. with everything in it, and it is very comfortable.

Now for the design of the bag. It has access points to the main compartment from the top, bottom, and the front, leaving plenty of options for you to get at all of your gear very easily. A folding top flap with two pockets in it. The top pocket is much larger than the bottom (on the under-side of the flap, almost a secret pocket).

The inside of the bag has a flap and a zipper for an optional separate sleeping bag compartment (barely fits a pair of sandals, a sleeping bag will not fit), a water bladder sleeve that goes all the way to the bottom of the pack, and two ports for the hose, one on the outside of each shoulder strap.

There are two outside mesh pockets, one on each side of the pack, and two mesh pockets on the waist belt. Unfortunately the belt pockets are the only part of this bag that I consider somewhat of a waste, due to their almost useless size. I don't know if my headlamp even fits in them.


Most comfortable pack I have owned. Great padding…

Rating: rated 5 of 5 stars
Source: bought it new
Price Paid: $169


Most comfortable pack I have owned. Great padding without being to cumbersome. Great from travel, day and multi-day hikes.


  • Gread padding in waist and shoulders
  • Instant access to entire inside at once


  • A bit on the heavy side
  • Top flap not removable

I have had this bag for the last three months, including a cross-country road trip, with lots of day hikes. This bag has been with me to the bottom of the Grand Canyon and back on a three-day trip.  Most recently I just spent the last month traveling around Turkey with this bag. It was small enough to fit under my seat during bus trips within the country, but big enough to hold everything i needed for a 3 day hike. Also worked well for day hikes using the compression straps on either sides. This bag is also small enough to fit in the over head compartments of airplanes so could be used as carry-on luggage.

Access to the main compartment was easy with the main zipper, which avoids the problem that most "tunnel" style backpacks have. Which is that you have to take every thing out to access things buried at the bottom great for trips where you sleep in different place every night. Extremely comfortable even when overloaded. Spent the last day overloaded walking around Istanbul with about 20kgs worth of gear and barely noticed.  Extremely comfortable Im 6 ft 200 lbs and the large size fit me like a glove.  an added bonus is the integrated rain cover pocket with rain cover.

I'm pretty hard on my gear and the pack seems to be holding its own. A few nicks and scrapes here and there but the construction seems to be solid.

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Manufacturer's Description

Visit Gregory's Z40 page.

Retailers' Descriptions

Here's what other sites are saying:

The Gregory Z40 is built for a quick overnight and general all-mountain use. Throw in your camping gear, climbing gear, or anything else you may need for a long day or two in the mountains.


The Gregory Z40 Pack is built for your quick overnight and general all-mountain adventures. Throw in your camping gear, climbing gear or anything else you may need for an escape to the mountains.


Gregory loaded its Z 40 Backpack with so many features that you'll be ready for any daily adventure whether you're hiking, summiting, fast-and-light overnighting, or climbing rock or ice. This pack can store all your climbing gear, light camping equipment, and everything you need for a full-day hike fest. Its CrossFlo suspension system provides a plethora of airflow to help keep you cool in warmer weather without sacrificing load transfer. The spring steel bar curves with a wire frame directly into the lumbar pad in order to ensure the load's entire weight transfers to your hips. Gregory covered the shoulder straps and waist belt with ventilated EVA to maximize your comfort on trails and approaches. This top-loader also features a U-zipper side access so you can whip out an extra layer at a moment's notice. The floating top lid is removable, and the integrated rain cover should protect your gear in case some black clouds unexpectedly float over your routes. Gregory also added an interior hydration sleeve with a hose port, a front bucket pocket that's perfect for helmets, a zippered front pocket for smaller items, two external stretch pockets for water bottles, and dual waistbelt pockets for sunscreen, lip balm, and snacks for the trail. There are also hideaway loops for ice axes or trekking poles, and compression straps at the bottom and sides to secure your gear.


The Gregory Z40 backpack is perfect for fast and light overnight trips. Light-weight construction and the new highly breathable CrossFlo DTS keep you comfortable mile after mile. This little brother to the popular Gregory Z 55 features an Auto-Fit harness system and side compression straps to further refine fit and control your load. A sleeping bag compartment with collapsible zippered shelf, dual hydration ports and sleeve, and front and top zippered pockets make getting to what you need easy without unpacking it all. Dual waistbelt pockets, side mesh pockets and Dual axe/tool attachment points give even more access to the items you need on hand. Part of the Gregory Z family, designed to make your next adventure lighter and more comfortable. Comfort Zone: 15-35 pounds. MD: 40 L (2440 cu. in.), Weight: 2 lbs. 14 oz. (1.3 kg), Fits Torso: 18 - 20 in.. LG: 42 L (2563 cu. in.), Weight: 3 lbs. 1 oz. (1.39 kg), Fits Torso: 20 - 22 in.. Materials: 210D robic dynagin, 100D robic GR shadowbox, 200D polyester oxford, 265g polyester stretch woven and 190T nylon taffeta. Available Color(s): Spark Red

- Tahoe Mountain Sports