The problem with most sacks isn't being puncture proof, but leaking at the fitting itself. You might want to ask them what their thread length is. If I'm not mistaken, the newer sacks have 3/4 inch or longer.
The 20x20x50 sacks are bigger. I bought a pair of Launchpad 725s but I'm not having any luck finding fittings for the inlet and outlet ports. I'm starting to think that I should have gone with Flyhigh instead.
i have 2 of the big bumps in the back for about 2 years now, not one problem, they work fine, I think the new ones are even thicker. Ihave the 750's though.
There is a video somewhere where they drop one of the big bumps off a roof full and it does not leak after it lands. I also own one of the big bumps and so do some of my buddies and they are great, no problems for 2 seasons.
The connection on those sacks is the "waterbed" connector. That is the only drawback in my opinion. I had one of the "big bump" for 4 years without any problems. The waterbed fittings are not quite as secure as the npt fittings used in the pro-x series.
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