The word '''ber' gets bandied about a lot these days, but in the case of the Granite Gear ''berlight dry sack, it's totally warranted. Clocking in at between 0. 53 and 0. 74 ounces depending on size, or less than half the weight of sil nylon, the ''berlight would practically float away if it weren't loaded with your gear. But of course, it's not just about weight, but about performance the CTF3 material used in these sacs is three times stronger than sil nylon between it and the roll top, your gear will stay dry in wet conditions. This ''berlight sac's eVent air purging bottom makes it easy to stuff a lot of gear into it, while the transparent material makes it easy to figure out what's where.