Lightweight. This  means that generally they cost less to ship.

Inexpensive. Padded mailers tend to be competitively priced.

Produced with built-in item protection. Because they are padded, these mailers may not need any additional structural support.

Speed of packaging. In a business that counts on every second to get as many packages mailed, padded  mailers pack out very quickly.

Small. Suitable and convenient for small items for packing that fits perfectly. No need for larger carton box that may take up space in delivery. 

Space saver. Padded mailers may take up less space when they are shipped to you by the manufacturer, which can result into cost savings. Plus, they take up less space in your warehouse ot packing station.