Edgar Sherman Design ESK, Sling, 1, 2-Point Combat Sling, Matte ESD-SL-DTS The ESD Sap Bucket is our solution to all the problems our team and our end users experience with dump pouches. The ESD Sap Bucket is a dump pouch that aids in gear retention" increases consistency when inserting equipment" drains sand" water and snow rapidly" and can stow away in a compact package.