I am currently thru-hiking the AT with my boyfriend, Timber and we both are using the Z-Packs. (I am taking a break off the trail until Sunday, so thats why I can type all this!) I have the medium and carry 33-35 lbs; he has the large and carries 35-38 lbs.
Overall, we have been happy with the packs. They are lightweight and the size is perfect I think–if a thru hiker needs more space than our packs, they better think again about how much gear they are carrying! the Z is a bigger pack than alot of other hikers have as it is. We line our packs with a trash compactor bag, so the cool side zip feature is useless for us. We also share a few pieces of gear between the 2 of us such as tent, water filter, and cook kit. However, even with all of our winter gear, I had no problem with space, and I was carrying the mammoth sized Cat’s Meow 20 sleeping bag (I did have to used a compression bag to get it in, but that is a common thing to use)
Problems we have encountered with the packs:
Timber’s shoulder strap actually began to rip off shortly before Trail Days this year. We inquired about a replacement with Gregory and found out that since this is a new pack and all the “kinks” are not yet worked out–there were LOTS of size large Z’s that had the same problem this year. They replaced the pack no questions asked.
My problem was that I had no more room to tighten the waist belt and you can’t just replace that as in some other packs. Luckily, at Trail Days, the pack designer was there and she actually cut my waist belt and sewed it back on so it was shorter. I guess what I am trying to say is that Gregory has great customer service if you have any kind of problem with their packs.
One other thing about the Z–the waist belt is hardly padded which you might want to consider. I find my pack to be uncomfortable to wear alot of the time, esp after a resupply. I adjust and re-tighten the straps several times during the day, although Timber doesn’t seem to have a problem with this. Perhaps it is just my body build. That said, its not bad enough for me to gett a new pack to finish the hike with.
One thing I have to say about the Granite Gear Vapor Trail–I know a thru this year using this pack, and it is a good pack as well. The waistbelt is more padded than the Z, and it can be entirely replaced if you need to different size. But, this hiker had the entire belt RIP apart where the buckles are and he had to sew it by hand until Trail Days when he could get it fixed. He also got a huge rip near the top of the pack in the material. You will undoubtedly have some sort of problem with which ever pack you get, so just make sure it is comfortable to wear and that you can get all your gear in it.
I know this was a lot of information at one time. Hope some of it helps you in finding a good pack.
Tumbleweed
tumbleweed