Hi! I hope you can help me out with this. I own a Medela Freestyle Flex and 2 Pippeta pumps. I am planning to go on glamping next month for two nights and I am worried about running out of power on my breast pumps. The site only runs on solar and 12v batteries. It also has a USB port. Unfortunately we don’t have a car so we cannot have that option. I was thinking if a powerbank would suffice. Or if there is a portable power source you could recommend? Thanks!