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I have been using a Feisol CT3441S for several years. It is about as light as you can get in a full sized, sturdy tripod -- a little more than 1 Kg. I have had a few issues with it, such as leg sections not sliding well when wet, wear on the leg angle stops, etc. But it all in all it has been a good choice for the application you describe. The legs fold over so the folded length is about 18 inches, even though this is a 4-section leg (studier than 5). Feisol makes other models with higher specs, depending on how much weight you want to carry.
I would also look at the Sirui N2204, with similar specs to the Feisol, only slightly heavier, and with an option of detaching one leg as a monopod.