This Desi Pak Hydrosorbent Silica Gel Desiccant is unlike our re-chargeable Hydrosorbent silica gel units in that it can not easily be reactivated and, thus, does not include an indicator system. It is perfect for a one use and discard application especially when reactivation is not possible. They will adsorb up to 20 percent of their weight in water vapor in 6 hours. An individual 1 unit (5" x 3 ½") clay in kraft Desi Pak will protect approximately .83 cubic feet of space. We package 10 desipak dessicant packets in a 4 mil extra heavy duty resealable ziplock bag for this price.