One of the categories of expedition that Outposts offers is the Open Expedition.
These are expeditions which are 'open' to anyone, from anywhere who is under 18 at the time of travel and older than 15. They are organised directly with Outposts and the individuals.
The other category of expedition Outposts offers is the tailormade expedition.
These are expeditions which have been specifically put together for a school or group. They are organised between Outposts and the school or group.