Single padding is 3/8" thick, for standard use. Double padding is 5/8" thick, for heavy use and sensitive items. No Padding is just the outer 1000 Denier Nylon, for dustcovers.

Reinforced Openings - For accessing the handle on the model. Choose the number of openings for the number of handles you want access to. No Handle Openings - For models that don't have handles like keyboards, steel guitars, pedalboards. Covers with no handle openings are not meant to be carried with the cover on.