Have you considered the Undercover Flex? This is what I decided to go with after going back and forth between it, the G4, and the bak.
I like that it's fiberglass instead of aluminum, each panel has slam latches, when opened completely it doesn't lean against the cab, and when folded flat it has built in secure straps (instead of having to use your own bungees like the bak)
what I came to the conclusion of is that NO folding cover is going to be 100% water proof. After finally accepting that I liked the flex the best!
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