These PBL heavy duty sandbags are professional high quality made bags. Each bag features a unique saddlebag design with dual 9.75" x 8" interior compartments. These bags have two carrying straps, one on each side of the bag, for easy handling. Each compartment comes with double zippers which are oriented opposite to one another. This makes material coming out of the compartment very unlikely. They can be filled with almost anything; sand, gravel, even nuts and bolts. These professional PBL sandbags will prove to be an indispensable part of your studio system for years to come. THESE ARE AUTH