Physically, BRV-BANK is a bit large for its capacity. Measuring 5” by 3.125” by 1”, it’s definitely still portable, but it’ll take up more room than the comparable—and much less expensive—AmpMax from myCharge, as an example. It’s a dense pack, with some plastic showing, but is mostly covered by a rubber coating on the outside. At one end is a watertight flap, which opens to reveal the battery’s…