Waterfield Designs sleeve for the iPad Pro 11". It has a magnetic zipper like opening and fits the iPad both with and without the Magic Keyboard. It has a nice soft lining inside.

There aren't any major size differences between any of the M series iPad Pro 11s so it should fit regardless of which model you have (I've tried with both M2 and M4 variations).

I've never actually used this sleeve with the iPad in daily use so it's essentially brand new.