I'm usually a minimalist when it comes to lightweight backpack equipment but after trying out a Big Agness 2.5 inch (Insulated Air Core, 20" X 78", 27oz.) sleeping pad a couple years ago, I decided the extra weight was worth it for a good night sleep. However, I have not had good luck with keeping them free of leaks...not good for sleeping. Anyone out there know of any good 2.5 inch thick sleeping pads that hold air better but are still in the range of 27oz.?