Thinnest Battery Mod

Also what bumper case do you use (can see it it one of your photos). Which bumper case would you recommend for use with battery mod?
 
Also what bumper case do you use (can see it it one of your photos). Which bumper case would you recommend for use with battery mod?

There's only two that I've used, the Verizon and Incipio. I prefer the Verizon (pictured) as it's thinner and lighter with a better grip IMO.
 
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