Yes, the Atmos Ag 65 comes with an integrated rain cover that you can detach
Thank you for your question. Unfortunately when the pack is full, it is pretty impossible to get any size of bladder in and out.
My understanding as a new owner is that the zipper is only for fitting the frame in manufacture or general assembly. The water bag slips into the tall pocket with elasticated top, against the person side of the pack interior. There you will find a small loop to keep the bag from collapsing downward and also an exit pathway to the exterior of the pack.
The box will be 26"x15"x7".
FABRIC
MAIN
100D X 630D Nylon Dobby
ACCENT
210D High Tenacity Nylon
BOTTOM
420HD Nylon Packcloth
Let us know if you have any additional questions.
It is too big for carry on for most airlines, but you can check it as baggage. I would suggest getting something along these lines: http://www.campsaver.com/osprey-airporter-lz-secure-backpack-travel-cover-2
This shields your pack from potential damage.
Thank you for your question. It unfortunately is not. The only packs that would work with the Daylite are:
Aether & Ariel
Volt & Viva
Poco & Poco Plus
Ace 75L
Shuttle
Soujourn