I tried out the Gregory 6L Amasa for the first time the other day on a mountain bike ride. In my review, I will be comparing its features to that of a similarly sized Osprey pack (Osprey Talon 11) , since that is the brand that I have the most experience with. So far I've only used the Amasa for mountain biking (primary use), but I expect I will also use it for festivals, city explorations, and other daytime adventures.
Pros of Gregory Amasa:
I dig the style. I got the black pack with blue accents and a pink interior. Pretty snazzy!
Lightweight and compact, with enough room for all the essentials for short and medium rides.
For it's size, it is spacious. One large compartment and a smaller top compartment padded for glasses or smartphones.
I like the mesh front pouch (instead of just bungeys), which may come in handy for quickly stashing a light layer or pair of gloves.
Comes with a separate little pouch that helps keep things organized.
Cons of Gregory Amasa:
No side pockets. This is something I've become accustomed to with other packs. Makes it easy to put something away without having to take off the pack.
Opening on bladder is pretty small which makes it a little difficult to fill with water.
Hip belt is relatively basic design compared to the Osprey. The Osprey has additional padding, material, and pockets on the hip belt. One perk of the Gregory hip belt, however, is that it is vertically adjustable to accommodate different heights.
No drainage hole in the base of the pack in case of spilled water. I spilled water in the pack and it was difficult to get all of it out. My other pack has a small drain hole to help with this.
Overall, the Gregory Amasa is a nice piece of gear and definitely one to consider when looking to purchase a small hydration pack.