Took a little while to work out that you need to balance pressure between the sand inlet valve and air inlet valve, but once adjusted it worked well. Some reviews mentioned the sand clogging, but I found that readjusting the balance between these valves again easily freed the clogg. I would also advise getting some tear-off plastic film like they use in motor cross, perhaps cling film would work.... because after a a couple of day's use, the perspex mask was sandblasted also, and you couldn't see through it.
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KROSER Travel Laptop Backpack 17.3 Inch XL Heavy Duty Computer Backpack with Bag
25 May, 2021
Great mobile office
Lots of pockets, well padded and seems durable to far.