Bought this for my girlfriend before a 1 week backpack trek through the Sabine National Forest and Indian Mounds Wilderness. Our first night, it rained heavily, had to setup our tent and equipment in a downpour. Both our packs (both are gregory's) kept our equipment dry. Over the course of the week, we ziplined our gear, crawled up hills of mud, waded through numerous creeks and dealt with an onslaught of scorpions. Through it all, the pack kept the gear safe, in tact, clothes dry.The womens version of the Z has more pockets and storage than the mens z55. The only down side is, my gf (a self proclaimed novice at camping) had to do a lot of adjusting on trail to get the most out of the bags comfort and suspension. The bag is also great as a day pack since it compresses down to such a compact size. Tip: the bags bladder pack is located on the very outmost point of the pack, to prevent punctures to your hydration bladder, refrain from installing the bladder til you're almost ready to hit the trail. Store it in a box or cooler upright during transit, and when installing use a piece of cardboard about 10 x 14 in between the bladder and zipper. This keeps sharp objects such as thorns, axes, snapped limbs,etc from poking a hole through the pack and into the bladder.

Where do I start?

First off, big kudos to these guys for having such amazing customer service and helpful employees. Our packs were lost in transit by UPS. Zach managed to find me a replacement pack, along with a pack for my gf, and got it to me overnight. What could have been a terribly disappointing set back, turned out to be no problem at all!

Bought this pack to replace a Northface pack I had for several years. It's first trip was to the Sabine National Forest and the Indian Mounds Wilderness. During our week trip I put this pack through serious hell. It was ziplined through the trees, hauled through the mud, dropped, slept on, stuffed to excruciating levels, and hauled up the side of white cliffs. This pack is very versatile. It rained the first few days we were out, and all my gear stayed perfectly dry.
A few things worth noting;

Zippers are rugged and do not leak.

A lot can be strapped to the outside of this pack, and I do mean a lot.

The bags compression ratio when not full is amazing, and can and has been used for day excursions.

The bladder sack is huge, but is on the outer most point of the pack, store your water bladder in a box or cooler or stiff container during transit nozzle up. When in use, place a 10x14 piece of cardboard between the material of your pack and your bladder to help protect the bladder from thorn, nail, branch, etc, punctures. This also adds a little durability to the backside of the pack in case you find it necessary to bail on your pack while being chased by bees. (amazing how fast you can move through the forest when being pursued by bees isn't it?)

The waist belt is awesome with lots of storage.

The bright color keeps it highly visible even in foggy conditions.

The suspension of the pack is fantastic, even with about 50-60lbs of gear loaded down on the pack, the load remained balanced and easily managed.

The one thing I have against this pack is I ran out of pockets! I'm a little OCD about having things stored properly, so I'll be investing in some stuff sacks to better separate the goods. Over-all I'm loving this pack!

Another bit of advice, practice disassembly and reassembly of the pack before your first trip with it. The amount of buckles and loops all being very close together can be somewhat confusing, and in my gf's case, very irritating.

Great buy! especially for the price!