Ask HN: What's a good dev laptop for outdoor use?

After reading the minimalism story the other day <http://news.ycombinator.com/item?id=4721645>, I got to thinking: until laptops with an e-ink screen exist, what is the best laptop for outdoor development? I've been trying to get healthier recently, and a big part of that is spending time outdoors. However, without a laptop that's difficult, since much of my time is spent developing websites and web apps. Does anybody have a recommendation for a good laptop, or class of laptops, that would be ideal for outdoor, in-the-sun, disconnected development? For example, going to the urban woods in my area, I can already guess that I'll need ample battery life and a cellular connection, plus some sort of screen that won't completely wash out in the sunlight.