I have the Atmos 50 but am thinking of switching to either z65 or Atmos 65 for more capacity. I like the idea of side or front access with the z55 and z65 which is not offered on the Atmos (Atmos 65 does have bottom access to sleeping bag/main compartment, but doesn't seem as handy as side/front). Anyone have comments on customer service/reliability issues with Osprey vs Gregory? I also wish the z65 didn't get rid of the front pouch style pocket to stuff things in. Anyone else find this to be nuissance or a non-issue? I Tried all these packs loaded in the store and found the gregory to seem a bit uncomfortable in the shoulders and the nylon zipper extensions seem to be pretty weak compared to Osprey's. This was mentioned to be a problem in another REI review post. Background info: I am looking for max versatility in pack from simple 2-3 day overnighters to extended but light trips in primarily warm climates. Thanks for any thoughts!

Tech Specs:

Material:

210D Double Box ripstop nylon 

Volume:

[S] 3600cu in (59L); [M] 3966cu in (65L); [L] 4332cu in (71L) 

Suspension:

1 Aluminum stay, molded frame sheet 

Hydration Compatible:

Yes 

Torso Adjustment:

No 

Detachable Pack:

No 

Sleeping Bag Compartment:

No 

Rain Cover:

No 

Access Types:

Top, front 

Pockets:

[External] 1 lid, 1 front, 1 water bottle; [Internal] 1 hydration 

Snowboard Carry:

No 

Ski Carry:

No 

Gear Loops:

None 

Ice Axe Loops:

2 

Shovel Pocket:

No 

Weight:

[S] 3lb 10oz (1.6kg); [M] 3lb 14oz (1.8kg); [L] 4lb 3oz (1.9kg) 

Recommended Use:

Backpacking, travel 

Manufacturer Warranty:

Lifetime