A large lock and lock style box, wrapped in a ripstop nylon bag. Please re-cover carefully as it's far too obvious to muggles otherwise. Cache contains a logbook, pencil, a sachet of silica gel to keep it dry and plenty of space for things for other things.
As this was muggled/vandalised I've replaced it with a smaller custom container with even smaller space for the log. You should be able to get it out by hand but it's probably worth having tweezers on you. Please replace carefully so that it blends in to reduce the chance of it getting muggled again.
Muggled again (or maybe it just fell apart) so I've exchanged this for a standard nano cache hidden nearby.