The Gator Cases GPA-450-515 Speaker Bag fits Mackie SRM450 & Similar Sizes. It is a 600 denier nylon bag with 10mm side foam. The bottom of the bag has structured foam to cradle the speaker. The bag is designed to carry various brand speakers, such as JBL EON 15 and Mackie SRM 450 speakers. It has a carry handle on each side.