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Gregory Z40 Pack

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The streamlined Gregory Z40 pack helps you slim down your load for light and fast trips. It carries like a dream so you won't be sacrificing performance for comfort.

  • CrossFlo DTS suspension provides cooling airflow across your back and effectively transfers load weight to your hips
  • Auto-Fit harness increases the stiffness of the frame as the load in the pack increases, helping ensure that the pack maintains its shape
  • Lightweight spring steel bar held in tension transfers load weight directly to the hipbelt and lumbar pad
  • 3 points of access make it easy to load and unload your gear, food and sleeping bag
  • Hydration-compatible design features reservoir pocket and dual drink-tube exit ports for on-the-go hydration (reservoir sold separately)
  • Easily accessible zippered front pocket lets you stash bulky gear
  • Top lid features a zippered pocket for stashing small items and a second compartment on the underside for securing personal items
  • Side compression straps let you cinch down loads for jostle-free carrying
  • Hipbelt pockets are ideal for stashing snacks, energy gels, lip balm, sunscreen or a mini-tool
  • Mesh side pockets provide a handy place for frequently accessed items such as water bottles, GPS, maps and snacks
  • Dual axe/tool loop attachment points let you strap on gear outside
  • Removable raincover stows in its own zippered pocket
  • Gregory Z40 pack is constructed from 210-denier HT double diamond ripstop and 330-denier nylon oxford flatweave fabric for tear strength and abrasion resistance


Item 809321

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Gregory Z40 Pack Specs
Best use
Lightweight backpack
40 / 42 liter
2,441 / 2,563 cubic inches
3 lbs. 4 oz. / 3 lbs. 7 oz.
1.5 / 1.55 kilograms
18 - 20 / 20 - 22 inches
28 - 34 / 34+ inches
Double-diamond ripstop nylon/flat weave oxford nylon
Tensioned spring steel
1 peripheral rod
6 + main compartment
Frame type
Backpack style
Gear capacity (L)
Gear capacity (cu. in.)
Weight - metric
Adjustable torso
Fits torso
Fits waist/hips
Frame material
Number of stays
Suspended mesh back panel
Pack loading
Pack access
Number of exterior pockets
Sleeping bag compartment
Raincover included

Gregory Z40 Pack

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Gregory Z40 Packis rated4.5455out of5by11.
Rated4out of5byfromPerfect for first overseas tripUsed this pack on a 17 day trip to Thailand/China and found it to be just about perfect. I wish the pockets on the waist straps were a bit bigger and maybe waterproof so I could fit a passport or iPhone. Had many compliments and even was propositioned to sell my pack to another traveler (turned it down). Packing smart, this pack could take you around the world.
Date published: 2014-03-15
Rated5out of5byfromThis is one great back packI bought the backpack for a trip to the Grand Canyon. I was extremely pleased with it. I hiked down to Phantom Ranch, hiked 12 miles both days down there and hiked back out. Perfect pack for me and I highly recommend it.
Date published: 2014-01-25
Rated5out of5byfromGregory packs are the real dealOut of all the packs I've tried over the years, Gregory packs seem to fit my body the best. Their suspension system and waist belt just work for me. (I have short legs and long torso.) I have have owned a few Gregory's and also currently own a larger model which I use for extended backpacking trips. With the Z40, some daisy chains would be nice as well as some straps or loops on the bottom for carrying a matters or the like. There are what looks like two "flat" loops stitched out of the bottom panel. I was able to thread some cords through and have makeshift straps but it's a little tricky. However, I'm not sure how durable this would be over the long term. Other than that this is a great pack.
Date published: 2014-01-19
Rated3out of5byfromA lot to like and some aggravationsI did a lot of research for a daypack that could hold a lot and had an airy suspension system because I use daypacks in hot deserts and humid jungles. I use this on day hikes year long but most importantly for overseas travel 2-3 times a year. It holds my carry-on valuables, photography gear, spotting scope, binoculars, and electronics: tablet, mp3 recorder/player, headphones, headlamp and flashlight and rechargeable batteries. That's a big, heavy load, but it manages just ok. When I get to my destination I then re-pack, taking out a lot of the heavy optics and electronics for hikes in the field, usually tropical jungle or deserts photographing wildlife and birding. As a daypack it works well and the suspension is great, but the aggravations can become real nuisances. Water bottles topple out of the shallow mesh side pockets even with the compression straps tightened. The slash pocket-style openings should be redesigned to make the pockets deeper. Zipper for the bottom compartment catches at the corners. Worst is the tendency for this pack to not want to stand up. It wants to lie down. Its favorite position is on its side or on its front which isn't the greatest for easy access or keeping away the mud or sand from pockets or openings. I'm sure its "laziness" is due to the suspension/mesh system which is great for keeping your back ventilated, but I don't like that trade-off. I would recommend it, but with the above reservations.
Date published: 2013-10-19
Rated5out of5byfromGreat Size for Carry-onI bought this pack for my girlfriend but used it during our latest trip as well. It was the perfect size for use as carry-on and worked great for hikes. The bag is light, but strong. The suspension is well designed and comfortable and the pockets are useful. The zippers do sometimes get stuck around corners, but don't really snag the fabric.
Date published: 2013-10-13
Rated4out of5byfromBest weekend pack on the market.This bag suites almost every need, demanded by a day of weekend pack. It has wonderful breathability, with a fully suspended mesh back. Also, the front zipper access to the main pack is phenomenal, as no other packs in its size range possess that, as well as a sleeping bag compartment. The rainfly is included, as it should be with every bag. The only thing that this bag does not have are central gear loops on which to lash bulkier objects like a tent. I chose this over every other model similar to it.
Date published: 2013-09-22
Rated4out of5byfromComfortable and supportive packI brought this pack after trying out several other packs at REI store in San Carlos. REI staff was very helpful and her recommendation to what I need was spot on. Because I have long body this pack fits perfectly with the weight grabs at the hip and not the shoulder. I took it for real trial on my 4 days Inca Trail trek in Peru last May. Initially it felt heavy even with light load (20 lbs) and I weighed 150 lbs. However, after 1-2 hrs I adjusted well as the weight shifted to the hip. I didn't feel shoulder ache or pain during the 4 days trek. Pockets weren't plenty but they are large to store big items. The downside is the mesh suspension that is supposedly kept the back cool didn't hold up enough because i found out that my back sweat soaked through the layer and slightly damped the clothing inside. Other than that I couldn't find any major flaw with this pack. I am confident enough to take it with me to Cambodia next year.
Date published: 2013-07-11
Rated5out of5byfromWonderful ProductGreat product. The thing I love most about this pack is the compressability of it. I compared the z30 and z40 in the store, and they look and feel about the same size, so why not get the extra 10 L of storage. The z40 also has a bottom access compartment that the z30 does not which is nice. The pack compresses well enough to take it even on a short day hike where the only thing you bring is a water bottle and some trail mix. You can open it up though to even take it on a short overnight. Bottom Line: The versatility was the big selling point for me.
Date published: 2013-06-28

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