I'm a very late adopter, I keep it in an
otterbox and in my pannier or pocket..
I only take it out & use it after I get somewhere & sit down.
FWIW the 2 better Ortlieb bar bags have a touch thru clear window on the top lid, ..
their premium one has electrical contacts on the bar bag & bar mount , so you can charge as you ride ,
and just pop the bag off and disconnect the circuit at the same time..
... Dynamo to usb converter in the bag or one on your stem cap ..
.....