I've used it once or twice and have initial impressions
Awesome hydration pack. Super light weight and packs down very well. I like it for traveling because I can fold it up and put it in my duffel bag. It kills 2 birds with one stone- practical day pack and water bottle in one. You can store my jacket or two, keys, wallet, and more. The quality is good and I did not find any defects.
I have the osprey atmos ag and love it so when I found out there was a hydration/day pack with the AG technology I had to have it. And I wasn't surprised to find I love Manta 20 AG too. Incredibly comfortable and makes a heavy load spread evenly and allows air flow. Great pack.