Collapsible steel baton
Extended: This is a finely made collapseable steel baton, extended and ready to use. It looks as if it could do quite some damage, and handily be collapsed for storage. It appears to have something written on it.
Collapsed: This is a finely made collapsable steel baton. It has been collapsed, making it less useful for hitting people but more handy to store.
Extended: The collapsable steel baton is about a foot long and an inch wide. It is made of klatchian steel and could be used as a weapon of type mace.
Collapsed: The collapsable steel baton is four inches long and an inch wide. It is made of klatchian steel and could be used as a weapon of type misc.
Available at Stronginthearm's weapon store in Ankh-Morpork for $240.
"flick baton" and "collapse baton" switch it between the extended and collapsed states.