Determining the weight of 100 CDs depends on whether only the CDs are weighed or if the CDs have sleeves or jewel cases. A single CD by itself weighs about 0.58 ounces. Therefore, 100 CDs by themselves weigh 58 ounces.
A paper or plastic sleeve on a CD adds 0.11 ounces. A slim plastic jewel case adds 1.5 ounces, and a standard plastic jewel case adds 2.5 ounces. Using these figures, the weight of 100 CDs in sleeves is 69 ounces. The weight of 100 CDs in slim plastic jewel cases is 208 ounces. Standard plastic jewel cases and the 100 CDs combine for a weight of 308 ounces.