I had always thought these insulated mugs seemed a really good idea, so when I filled up the Rangie at the local Safeway store and they were selling them for £2.99 or something I thought I would get a couple. Bad move! There is a sliding cover to close the little 'ole you drink from, but when it's shut the contents just flow out anyway if you tilt it away from the vertical. Are the LR ones any better? I still want a couple, but I'm a bit wary of spending a tenner or so if it does the same thing.
I suppose it's another in the series of "Lessons in Life - No. 46: you get what you pay for".