I prefer to record my observations, etc., daily, at the end of the day. I'd already forgotten stuff when I tried to collect 2-3 days at once. That is true, but I find that if I type a few sentences every day on my phone I have enough to jog my memory when I want to flesh out the journal later.
I advise keeping it light and simple. I'd recommend taking a net book at the very most.
BTW, anyone ever try roll up or fold-able USB keyboards that weigh under 8 ounces and supposedly work with many smart phones?
My father tried a roll-up at home for his kitchen... Supposed to be designed for hospital use, waterproof so it can be cleaned... Worked great for a bit, but when rolling it, the plastic sheets inside became misaligned and wouldn't sit flat, then a hole formed at one of the keys, and it stopped working because they washed it, not realizing that it was no longer waterproof. Maybe there's others that are better but my fold-up keyboard works great with my tablet and I keep it, my Goal Zero Venture 30, and my 10" Galaxy S2 tablet (in a cover) in the same dry bag. I'm thinking about making a custom cuben fiber bag specifically designed for it all, but that's another topic.
As to the OP...I'd say a laptop is way too big, and a smartphone is way too small. I think the answer lies in between. Paper is heavy, and if it gets wet, forget it, whatever was on it is lost. A small tablet with 4G you can sync up and use something like Google keep to journal your trip, if you get it wet, your data is still in the "cloud"
A small tablet or large phone will charge fairly quick, and it can double as a phone, a GPS, a camera, a computer... I can even edit videos and photos. A large smartphone might suffice for just posting and basic needs, but not for editing.
It all depends on your needs though, and as stated, there is a temptation to use it as a time waster after your ride, although, when power sources are scarce, you learn to be frugal or you risk a dead device until you can recharge it
I originally wanted a 7 inch tablet, but they're getting difficult to find in any variety. I find I like the 10 inch and would find it difficult to go smaller... To bad you can't test drive them.
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