I've used a pair of pelican 1550s .. there are still waterproof.. but they will flex if given enough load - like a fall at 50mph into deep soft sand .. found heaps of sand inside after that... but they don't leak after that in subsequent rain/water.
Having said that .. I still use waterproof stuff sacks inside them for anything I want to stay dry. The principle is - if one thing fails you need a backup for critical stuff. These should be different colours so you can tell what bag you are picking up - pants and shirts in one, toilet paper in another etc.
Inorder for your al bags to leak there must be a seam/hole/cut somewhere. Sealing it with silastic should work I'd go over your bag again and remove as much of the old silastic as possible (use a knife), Then clean/roughen it with scotchbrite and reapply fresh siastic. Do that on both inside and outside - should keep most of it out. Put it in a bathtub if you want to test it.
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