Apple sells only one MacBook sleeve in its online store: the leather-free Bellroy Caddy for Mac Laptops, which is available in two sizes for 13-14-inch MacBooks and the 15- and 16-inch MacBooks.
Laptop cases can be a good idea ... You'll forget the case is even there Incase's Dots Hardshell Case is designed to fit either the 13-inch or 15-inch models of the M2 MacBook Air.