Can this material withstand rain? I believe...
Can this material withstand rain? I believe that same material (420 ACT) is being used for Altra 65,75 and Naos 85?
It is not waterproof but will do a pretty good job at shedding rain for a while. If you are in a true downpour you should use a pack cover.
The Altra fabric is waterproof, as it is backed with a urethane skin. The seams are not totally waterproof, as in seam-taped. This gives the Altra packs alot of water resistance, but for heavy, sustained rain, a pack cover would be best.