I keep books but only the good ones the rest i take to charity shops. Most of my books are historical, or old photos of the local area, or tree, animal or bird guides.
We have a large concrete shed / store room and put them in large lidded plastic containers with the gel to stop them going damp.
I have lots of things in that shed, tools, things i have found out walking, things no longer used. I spend quite a bit of time in there, especially now there is nowhere to go.
I keep my bush hat in there and have ordered some tobacco for my pipe.