OK well try to design a better one of the same size and then imagine pulling it on the USB cable from different directions and think what will happen.
Easily done if you get a big peice of paper and solve each of those problems you thought of, modify the design, then imagine pulling the USB cable.
I carry multiple USB chargers to solve different situations.
- don't expect to need power - Fusion 5000
- do expect to need power for a couple of items during a day - Powerport II 2
- do expect to need power, overnight stays, in a known place with good wall sockets - Powerport 2 + your charger. (I just did this last week)
- do expect to need power, many overnight stays, in unknown situations, Powerport 5 + your charger.
So I use your charger as a backup.