Case for TomTom BT Receiver?

[pach]

Does anyone know of a case for the TomTom BT GPS receiver - I'm forever chucking it in my briefcase when I get out of my car at work, and finding that it has switched itself on as the power button has got pushed down in the bag, and promptly drained the battery.

I've done a few searches and not found anything yet, so my best solution at present is to stop wedging so much in to my bag in the first place so things don't push against the power button!!!
cheers
P.

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