TTD
Carting a laptop around the network will be far more trouble than it will ever be worth.
It will provide you with a never ending source of frustration .... plugs, wireless settings/connections, hotel telephone exchange systems, access numbers. If you still insist then I can guarantee it will be stolen somewhere or at the very least cause you undue trouble at every security check point.
If you have it with you, you are supposedly contactable..if you use hotmail or whatever, you may or may not be contactable.... same goes for bl..dy mobile phones.
Last time I looked they still had things called books that you can use to pass the time..and not as bad for you as CRT screens.
If you need to play with numbers, bring your jepp CR-2...mine hasn't been powered up for 30 years and it still works fine.