I have run coverless sacs exclusively and had one failure in 3 years of filling it to the max, right now I am on my 4th year of the side sacs I think and no problems, I try not to step on them because thats how I blew a seam out of my large sac, they seemed fine and great for the price... I am going to try to patch my large sac with a pool patch kit, will report how that works out
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