Gitzo produce a number of tripod ranges. For something light to go on the back pack the Traveller range is ideal. The Mountaineer is a traditional style of tripod with a sliding center column, while the Systematic is a solid, modular version which is ideal for big lens work and video.
Gitzo compact traveller tripod GT1545T
Gitzo GT0545 traveller tripod - the most compact of the Gitzo traveller range.
Gitzo Center Ball Head GH1382TQD - special profile for compact traveller tripods.