Last time I was out offshore it was a little rough, on the way back to the beach it got worse with winds blowing 15-20. about 200 yards from shore, I got hit by a wave from the port side, and sure enough I flipped. Part of if was my fault for having the seat set on the high position, lost my balance and went down quickly. I had my 9+ pounds casting net and some other stuff inside the front storage, so as the kayak was facing down, the weight of the casting net pushed the front hatch lid open enough to let the water in, so as I was turning the kayak over, the front hatch opened, and I lost the white liner, casting net and some other stuff. My PA got full of water and I couldn't get back in, luckily I was out with some of my fishing buddies that day and they were able to towed me back to shore. Moral of the story, never go out alone and if you like to store heavy stuff on the front compartment, make sure to lock the front hatch with extra latches , here is what I added as an extra and simple locking latch.
http://southfloridakayakfishing.com/showthread.php?tid=3