You are looking for a tupperware type container with a clip down
lid, it contains lots of the normal items.
I would recommend parking in the Severn Trent car park at the
end of the reservoir (N 52*48.008 W 001*26.706), and walking into
the rear of the grounds by the concessionary path. It's a pleasant
stroll by the side of the reservoir, up past the Deer Park, and
about a mile to the cache. When you’ve found the cache, if
you head due south to the perimeter of the deer park again, then
follow the path going south where possible, you will arrive at the
house. Where if you head to the vehicle exit, (past the church and
the farm) you will arrive at Calke village which is at the top of
the road to the car park. Making a circular walk of 2.25 miles.