I recalled having seen a big photo album of similar size in the bookshop in town a while back (when I was looking for smaller ones for other projects). So I went back now to check if they still had that big size. They did, so I bought it (the red one).
In some ways the big album is not very convenient, as it gets very heavy when full, and is too big for most of my shelves! But for this particular project it felt right, as it matches the shape and size of the old one - and the cards I primarily wanted to get sorted were from the same time period (going back even to WWI). (The new album has plastic pockets though. Not sure how good that is from archive point of view. But at least it's convenient for now!)
After I had put in the old cards from grandma's box, there was still room in the new album for some more. So I dug into another box, and also added some from my own lifetime - like cards sent to me from my parents, or from me to them.
All of this also stirred my interest in the really old cards again... So I'll give it a go to revive my old plan of posting about them on my family history blog, Greetings from the Past. A project started in 2012, but abandoned after a couple of years, because I just had too much else going on... (And I think I was without a working scanner for a while as well.) Between 2013 and recently, I only added a few posts based on photos rather than on the postcards.
But just now, I think I'm again feeling inspired to continue with the scanning and blogging of the postcards... I'm just about to reach the time (winter 1902/03) when Gustaf (the postcard-collector) and his sister Gerda (writer of many of the cards) both emigrated to the US. (He went Pennsylvania, she to Chicago.)
If you're interested, there are permanent links to the Greetings from the Past blog in the sidebar of this one.