North Carolina Dad wrote a review of Black Diamond Magnum Backpack - 976cu in on July 25, 2009
This is a small pack--which fits the bill nicely for day trips and doesn't get in the way whether you are climbing rocks or navigating through crowds. It can snugly hold two water bottles (two excellent elastic mesh pockets on each side), a rain coat (tied on the outside), camera and snacks--not much more. The harness is very comfortable and capable of supporting the load--and pulling it in close so it isn't flopping around throwing off your balance. The cargo area is very accessible and has a zippered inside pocket and another inside pocket.
We liked it so much we bought one for everyone in the family and have taken it on every hiking/canoe/swimming/car trip since. My wife loves it and has taken to leaving her purse at home in favor of this little pack. On our last trip to the waterpark there was enough room for a beach towel and one other item inside, either lunch, spare shirt/socks, or medium size camera bag.
While the pack makes no pretension of being waterproof, it did hold up well in the bottom of the canoe on the last trip. Only the items around the zippers were wet (the outside was muddy and wet). We have used these on short rainy hikes exposed to the downpour, and didn't have issues with our gear getting wet inside after three hours. A couple of more hours and the contents would probably have gotten wet--but we were done before the packs gave out.