D U H
I recently borrowed this system at a Sniper Competition in Europe.
It is a Drag Bag, which fastens together by way of clips and zips, but opens out into a purpose built shooting mat when unfolded.
The Drag Bag contained mt AI AW with 5-25 S&B PM11, spare magazines, 100 rounds of 308 in MTM boxes, digital camera, first aid kit etc etc with loads of space to spare. It has both rucksac and carry handle strap and was very functional and durable to use.
I don't think they are available outside Europe as the maker is from the Czech Republic, however, I can put you in contact with gent I borrowed it from as I think he has the contact details of the supplier.
Sorry, its the only photo I have.