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.

Anything bigger tends to be cumbersome to pack and unpack, especially since most bags and laptop sleeves aren't built ... it may be wisest to get a 13- or 14-inch laptop, and pair that with ...