well, looks like I had to open a Photobucket album in order to post pictures.
Our Turtles are about 12-13 yrs old now. They started out in a 20 gallon aquarium, then a 100 gallon, and finally have ended up outdoors in a 150 gallon rubbermaid stock tank. Now that we finanlly have our first home, we are ready to dig an in ground pond for them.
These 150 gallon rubbermaid containers have worked well. We use one to house the turtles and another for filter & planted bog. I know it is not recommended on this forum to let turtles hibernate, but ours have been in this container outdoors for the last 6 years without any problems that we know of.