Moveable caches are caches without a fixed location. When the cache is found, the finder takes the complete cache to a new location, hides it and updates the co-ordinates on the cache listing website.
Moveable caches can be listed on Geocaching Australia. Groundspeak no longer accepts moveables for listing on geocaching.com. However there are some grandfathered moveables on their system. On The Run is one such cache.