Bought Walmart soccer type sandals for $6, weigh 8oz. Decided to stay with them as I can wear with socks in cold weather. Looked at Hey Dude closed toe shoes thet weigh 5.5oz but $55, pricy!
You won't find anything cheaper and lighter than these, but I wouldn't try to cross a stream in them.
http://www.gofastandlight.com/Ultral...CL-N-FLIPFLOP/