Better battery case for X-Pro1?
I have 4 extra batteries for my xpro1, and I use ThinkTank battery holders:
DSLR Battery Holder 4: http://www.thinktankphoto.com/products/dslrbatteryholder4.aspx
AA Battery Holder:
I have both but usually I just use the AA battery holder as I hardly need to bring more than 2 spare batts with me, unless I am on a long vacation without frequent access to power source.