The best one I have seen is the old Losi bottle that you would actually seal the cap so you could not take it out and so it would not leak. Most people use that one at our track and it doesn't seem to have any problems. It is a softer bottle as well and makes it easier for filling.
Here is a link to the one I am talking about
:
http://www.losi.com/Products/Feature...rodId=LOSB5201