Spare cart on keychain

[Jalise]

Does anyone geocache or just own one of these

Cache Advance

I'm wondering if a cart/atomz (w/silicone caps) will fit inside so that I can keep a spare on my keys. The website has product dimensions but I'm not sure if they are interior or exterior, and in this case it matters.

This is the best I have found, and there waterproof, but any other suggestions are welcome. I'll probably end up buying one to find out if it fits if no one else confirms it.

I posted this in the V4L forum because they have the most user traffic but it wasn't much help. Someones posted response did say what I was thinking though - these should be manufactured and distributed for such a purpose - Steve?

 

[MuddyBears]

I actually bought something similar to this at walmart. Its purpose is to hold nitroglycerin or other pills on your keychain. I use it to carry an extra 510 cart around.. was only a couple dollars.. hope this helps..