I have the grey in mini size and I’ve no issues with colour transfer. I’ve also got a nano belt and a micro luggage, in colours little darker than white and again no issues. But I spray my bags with carbon pro and always treat my denim, whatever price they are, with vinegar to stop any dye bleeding.
Both are all year round colours and I adore grey but I think light taupe is slightly prettier/more feminine for summer dresses. It’s a colour I wished I had bought as well as the grey.
I haven’t heard of the vinegar treatment for jeans, but I looked it up and might have to try that (just for the sake of the jeans lol). Thanks so much for your thoughts, I think the taupe probably fills the need for a light neutral better, but I still love that gray and would less concerned with wear. Glad to hear your other light colored Celine bags haven’t had any issues.