HP OmniBook 4150 Reference Manual page 47

Operating the OmniBook
Working in Comfort
Take frequent, short rest breaks. This is especially important in a mobile computing
environment.
Portable computers weigh between approximately 1.4 and 3.7 kilos (3 and 8 pounds).
When traveling, be sure to carry your computer properly to minimize strain on your
body. Shift the bag containing your notebook equipment frequently between your left
and right hands and shoulders.
Reference Guide 47