Now you think that tin can rises eye brows of security? How about gutted cell phone? Don't get me wrong I think it's a great idea and you don;t get ask 3000 questions about it from bystanders since it looks like a cell. But going thru a check point (xray/metal detector) what will raise more questions: a tin with unknown content or guttet cell phone with unknow content? I'm just saying... I like what you proposed and I may even try it (except I use old cells for target practice). But while we are at it why not use an old walkman, radio or camera?

Matt