This is the one I have been using for the last five years, bluetooth, andriod, iOS and WIn.
Folds up into a solid case. It then slips into a nice leatherette case. I just toss it into whatever bags I am carrying toys in.
https://www.bhphotovideo.com/c/produ..._keyboard.html
My Logitech travel BT mouse is the previous generation of this. It supported Win Andriod and iOS. Latest version does not. # years of living in bags and being tossed around and still going strong.
https://www.logitech.com/en-ca/produ...se-m557?crid=7