Decades ago, I had a rather nice folding keyboard for an early Qualcom "smartphone". It was mostly aluminum, and folded into a ~10 cm square, maybe 2 cm thick.

Decades ago, I had a rather nice folding keyboard for an early Qualcom "smartphone". It was mostly aluminum, and folded into a ~10 cm square, maybe 2 cm thick. Unfolded, it was about the size of a netbook keyboard. I would have kept it, but it was cabled for a docking stand, and I didn't want to attempt rewiring it. This silicone keyboard looks interesting: https://www.amazon.com/Sungwoo-Foldable-Silicone-Keyboard-Waterproof/dp/B06WWM5TC6/ https://www.amazon.com/Sungwoo-Foldable-Silicone-Keyboard-Wa... But maybe not very durable.