There are a lot of options for mounting your iPhone in your car. I’ve relied on the highly-rated Kensington suction cup windshield car mount for a few years without too much incident. However, I’ve never been too pleased about how it blocks a bit of my driving view and requires a non-elegant wire to go up my dashboard.
What’s nice here is that the portable Travelpak can charge two USB devices at the same time while plugged in. It has a nice bright 5 bar light system telling you if it is charging or how much charge it has left (making it a night-light as well). What’s even nicer and contrasts from other plug/batteries is that it turns off when unplugged and only starts charging again when you hit the power button on the side. Where typical generic AC USB batteries will drain unless they are powered down, these will automatically turn off.
On the down side, when the plug is extended, the 4000mAh version can cover up the other plugs in a wall outlet or surge protector making this aspect of the design puzzling. Still, the other plusses far outweigh this technical oversight. It appears that the new high end 6000mAh and 11200mAh form factor fixes this issue and at a cheaper price, it is hard not to recommend this version.