Folding Backpack Sluice Portable Box Miningcollect. Asr Outdoor Aluminum Folding Sluice Box And Backpack (% similar) Inside the backpack, we've included a sluice box for gold prospecting flange comes with carpet, miners moss shoulder strap canvas backpack: lots of space in central pouch able to contain 30 liters or 1830 cubic inches volume two large side and one front ...