I’ve been using a small folding umbrella from MUJI that I bought 8 years ago. Not particularly expensive.

My partner has probably been through about ten umbrellas in the same time-span, because she was reluctant to spend the modest extra amount for something she doubted would last so long. I recently bought her the same model of umbrella from MUJI, although it’s too early to say whether the company has maintained the build quality.

I think it’s this one (but hard to tell on their awful website) https://www.muji.eu/pages/online.asp?PID=14951&qclr=45503441...