leaveword1676537 wrote an answer about Arc'teryx Altra Backpack 62 - Women's - 3783-4394cu in on April 6, 2011
No, it's not waterproof and two of the four zippers leak. The pack cloth is very water resistant. But count on using waterproof stuff sacks for those items that can't get wet. The pack cover sold by ArcTeryx is 9 oz. You can save substantial weight by using waterproof stuff sacks.