Rubbish Finds bag
This pouch is approximately 240 mm wide and 300 mm high. it has a zippered section for valuables, a velcro section for other finds, and and open section which also has two smaller integral open sections. It is able to be slid over a belt up to 75 mm wide to secure it to your person and has two side ears that could have a strap or rope added to make it a shoulder type item.
This is a genuine Minelab spare part.