I have 5 of the old style fat sacks. The type with an inner liner and a fabric style cover. I notice that newer sacks come without the cover. Are these bags heavier to resist punctures? I want to replace two of the permanently mounted bags, in the trunk and ski locker, because the old style holds moisture and traps water between the cover and bag. I need to make sure the newer bags wont rupture if gear is thrown on them.
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