I just did a search for Marvel straplocks following finding them attached to my Overwater.
I'm a fan, and very reasonably priced too. The locking mechanism only prevents the male slipping out of the female bit (macho fnaa comments go in here) and isn't load bearing as suggested above.
I thought they'd be far more expensive.
I'd also vote for Comfort Strapps as opposed to Brooklyn Gear in that Brooklyn gear, and the Bass Collection derivative have been known to fail at the plastic links. To the guy that chops the end off to prevent the buckle digging in, do you realise that both the holes are meant to be used?