I know this might sound rudimentary, but WAY back at OPCT2 I just poked some holes in the bottom of the pouch I was using for my dump pouch. If you use eyelets (you can buy them from fabric land) thus the sand drains out. It really worked well for me.
Get a second dump pouch for sandy condition and modify it with the eyelets.
Just a suggestion hope it helps.
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