[quote name='Gottastopbuyinggear' timestamp='1469014362' post='3095060']
You can buy USB power packs and USB to 9v converters on Amazon. I spent £20 on a 16,000mAh power pack (which is knocking on 3 times the capacity of the old PedalTrain Volto) and £10 on the converter and it's been great. It was more a convenience thing for me - one less mains socket to find and lead to trip over, and quicker to set up/tear down.
The only thing I found was that if there was no current draw then the power pack would power off, so if you're using a pedal that is truly off when it's off (if you see what I mean) or only draws a very small amount of power then you might have problems. I found a BDDI or VT Bass don't draw enough, but having a TU-3 in the chain is fine, presumably because it's buffered and the buffer's drawing enough power.
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Do you have links to the stuff on amazon by any chance? I know I could search myself but it's always nice to have somebody's say so that a thing works rather than finding something random and discovering for yourself that it doesn't!