The Modular Accessory System(M.A.S.) offers additional accessories that quickly attach to any belt or Tamrac products that have the M.A.S. quick-attachment system. Using a security flap with a combination of hook & loop and snaps, these accessories are easy to attach and provide a fast and secure method for customizing many of our backpacks, hip packs, shoulder bags, and the M.A.S. padded Modular Accessory Belts. Whether it"s extra lens cases, a water bottle carrier, or filter pack, you can now customize your Tamrac carrying system to match your exact requirements.