I had a Psion 3a - it fit in my back pocket and was strong enough it didn't break when I sat on it. I carried it everywhere and used it as my main device for ta

I had a Psion 3a - it fit in my back pocket and was strong enough it didn't break when I sat on it. I carried it everywhere and used it as my main device for taking notes in meetings - the combination of form factor and a usable keyboard was great. Then I lost it and got a Psion 5 as a replacement. Despite the keyboard and software being way better, it was just that little bit larger and heavier so that I didn't carry it everywhere. It lived in my bag, not my pocket, so in the end I used it less. So I switched to a Palm V, which was a wonderful light form factor and looked fabulous, but I found I didn't really use it at all, except as an address book. The lack of a physical keyboard made it basically useless for my main purpose. In the end, I ended up with an ultra-lightweight Sony Vaio PCG-505 laptop, ran FreeBSD on it, added a Ricochet radio modem, and never looked back. Even 27 years later, I still think the PCG-505 form factor looks good, and at 1.3kg it weighed the same as today's lightest Macbook Air.