Maybe only fill them 1/4 full and fold the top under them before setting down on the ground? I'm just tossing out ideas.
Although not what you are asking for, one technique that worked really well when I had my place in FL was to wait for the lowest tide of the month and stack bags of Quikrete. When the tide came in, it instantly made a permanent concrete seawall that looked as if it was made out of sandbags (DOW wouldn't sign off on some permanent walls but stacked bags seemed OK for some reason). In spite of Quikrete bags not being "sand", they're about the same size as a typical sand bag, far more durable after being soaked and no amount of Colorado UV would break them down. -just another option...





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