I am a "one bag" traveler and look to minimize weight wherever I can - everything counts. The 67W charger is a bit bulky, and I would like to find the minimum size charger that would get my 14" Pro from 20% to 100% overnight. I see some compact 30W chargers on Amazon, and I might even experiment with the 20W that is supplied with the iPad. Does anybody have any field experience with lower watt chargers?