I thought about exactly this subject and wasted a long time looking at various options. Finally I spent a week noting down what thought I might need "techwise" while on the road (I spent a week as you always think of something later) Having decided what I needed to do, I looked at what was the smallest package to do it all. In the end I settled on my current android smart phone which had cost me £90 with appropriate "apps" ( most free ). It amazed me what apps you could find to do the most unexpected things.

It charges easily from the bike, even while stopped with no problems of flat battery. App for sky scanner for flights is good. Booking.com app or similar for hotels. Wifi no probs. (There may be a blog app) Stick in a plastic zip bag to keep dry. Wrap it in you pants to keep it safe from knocks if you have too. Most take mem cards so you can transfer photos from cameras for blogs, if the built in camera is not good enough. Some cameras have wifi connectivity so link up easily ( prob an app for that too? )
And of course you can make a phone call, store music or "local" language lessons as I do ! ( there is an app for that)

Security wise it is one less thing to worry about, just stuff it in your pocket.
Back up sat nav if required. ( there is an app for that )

One of our trips we took an ipad mini. It was ok but every time we left the bike somewhere we had to carry the thing about with us and constantly think......oh where's the ipad. The little phone did all the ipad could anyway, so we leave it at home now.

We don't blog or facebook or any other "keep home informed of what I'm doing" type thing, other than email which all works fine for us with what we now carry. People do blog using phones so it can be done ok, but its what you find you can get on with.

Yes the keyboard may be an issue for some as it's "virtual" but I did get used to it quite quickly. I have seen flexible roll up/ fold up keyboards which may be an option? All this tech stuff moves so fast these days, so much so, you don't actually need a keyboard any more. Voice recognition is now quite standard on smart phones so you may well find just speaking you blog is an option. There's prob an app for that............

I did post this using a PC and key board, but I do have an app for this

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Regards Tim

Learning my craft for the big stuff, it won't be long now and it's not that far anyway