Gregory Z45

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


small medium large
Weight 3 lb 12 oz / 1.70 kg 3 lb 14 oz / 1.75 kg 4 lb 1 oz / 1.85 kg
Capacity 2563 cu in / 42 L 2807 cu in / 46 L 3051 cu in / 50 L
Torso length 16 in - 18 in 18 in - 20 in 20 in - 22 in



The Z45 is a versatile little backpack... large enough…

Rating: rated 4.5 of 5 stars
Source: tested or reviewed it for the manufacturer (keep)


The Z45 is a versatile little backpack... large enough for a 2- or 3-night trip into the wilderness, but small enough for a day pack or even a summit bag.


  • Quality construction
  • Great pockets
  • Nice fit


  • Color

This is a great medium sized backpack from Gregory. It has the quality construction you would expect from Gregory. I have used it as my summit backpack for a few months and it has worked great for this. It is a very comfortable backpack.  

Here is my full, detailed video review:


Have had this for about a month now and have taken…

Rating: rated 4.5 of 5 stars
Price Paid: retail (had a free gift card)

Have had this for about a month now and have taken it on several short day hikes.

I did a lot of research and really like the way this pack fits in to my lower lumbar region. This pack is from the Gregory Jetstream LTS (Load Transfer Suspension) line of packs.

What I really like about that series is that it minimizes the points of contact with your back and thus provides great ventilation without the use of mesh or "trampoline" style systems that have become so popular.

It also has an adjustable hip belt system that is great at fine tuning to you body type.

Being tall and thin I could dial this in and have the load ride very comfortably on my hips and not the shoulders. The pack does not slip down my hips the way many others did that I have tried.

The 45 liter capacity (actually 50L for me since I have the large size) is a perfect compromise for me. It allows for full day winter hikes here in the Northeast where lots of gear is required.I had no problem strapping my snowshoes to the outside and carrying full winter gear including crampons,poles etc.

It will be big enough for 3 season overnight hikes as well.

Very comfortable carry and weighs in right at 4 lbs. Not ultralight but very solidly built and I like the fabrics. I am suspicious of 2lb, 50-60 liter packs as far as longevity is concerned.

The front shove it style pocket is great for quick access to windbreakers etc. The 2 pockets on the hipbelt are great for my camera and cliff bars

The only improvement I would like to see, and this is typical for almost all packs, would be the ability to remove and replace water bottles easily from the 2 side mesh pockets. I am old school and do not like hydration systems and water bladders as they are a pain to clean and prone to freezing on winter hikes.

Overall am very happy with this and hope to use for many years.

Where to Buy

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Manufacturer's Description

Visit Gregory's Z45 page.

Retailers' Descriptions

Here's what other sites are saying:

On Sale. Free Shipping. Gregory Z45 Pack FEATURES of the Gregory Z45 Pack Jetstream LTS Suspension Dual hydration ports and internal sleeve Side, bottom and top compression Dual quick access waistbelt pockets Exterior side pockets with pass through compression Water-resistant zippers Top load access Side zipper access that goes the length of the pack Single axe/tool attachment point with secure carry under compression flaps Large, stretch mesh front pocket Removable top lid SPECIFICATIONS of the Gregory Z45 Pack Fabric: 210D double diamond ripstop and 210D x 420D HD flat weave fabrics The SPECS for Small Volume: 2563 cubic inches / 42 liter Weight: 3 lbs 12 oz / 1.7 kg The SPECS for Medium Volume: 2807 cubic inches / 46 liter Weight: 3 lbs 14 oz / 1.75 kg The SPECS for Large Volume: 3051 cubic inches / 50 liter Weight: 4 lbs 1 oz / 1.85 kg Click to download some super information on how to properly Fit a Gregory Pack . OVERSIZE ITEM: We cannot ship this product by any expedited shipping method (3-Day, 2-Day or Next Day). Even if you pick that option, it will still go Ground Shipping. Sorry for being so mean.

- Moosejaw

The ultimate day pack or lightweight overnight pack, Gregory's Z 45 includes all of the features you would need in a mid-size bag to take you into the wild and bring you back out again. Th harness and waistbelt both sport ventilation and moisture-wicking capabilities to keep you cooler and dryer during those high energy pursuits. Keep your load stabilized with bottom, side, and top compression straps and access any of your gear at any time using the full length side zipper. PRODUCT FEATURES: JetStream LTS Suspension with 3 waistbelt size adjustment options Ventilated and moisture wicking harness and waistbelt Side zipper access that goes the length of the pack Large stretch mesh front pocket Dual hydration ports and sleeve Removable top lid Side, bottom and top compression Dual quick access waistbelt pockets Exterior side pockets with pass-through compression Single axe/tool attachment points with secure carry under compression flaps Water-resistant zippers 7001-T6 hollow aluminum stay 210D double diamond ripstop and 210D x 420D HD flat weave fabrics Volume: Small - 2563 cu/in (42L); Medium - 2807 cu/in (46L); Large - 3051 cu/in (50L) Weight: Small - 3 lb 12 oz; Medium - 3 lb 14 oz; Large - 4 lb 1 oz Torso length: Small - 16"-18"; Medium - 18"-20"; Large 20"-22"

- Appalachian Outdoors

Gregory's Z45 is a streamlined pack designed with everything you need and nothing you don't for loading up and hitting the trail.


A great pack for weekend warriors. The Z 45 from Gregory has a Jetstream LTS frame that handles heavy loads and keeps the pack from directly contacting hot-spots on your back, allowing for superior airflow. The front panel zipper and top-load opening allow access to anything in your pack and compression straps make sure that your load is tight and secure. A built in raincover and a single ice axe or trekking pole attachment make for a versatile pack you can use anywhere.

- Mountain Gear