The Leather Sleeve was an exclusive accessory to the 12-inch MacBook but now Apple is expanding it to the MacBook Pro lineup.
Apple adds Leather Sleeve for new 13- & 15-inch MacBook Pros
MacBook Pro (15-inch, 2019) - Technical Specifications - Apple Support
Leather Sleeve for 13-inch MacBook Pro & Air
The MacBook sleeve by INCARNE™ with Apple logo. Gamma Plus is made of genuine Crazy Horse leather (black, gray, brown, green, blue, burgundy, cognac)
Leather MacBook sleeve with Apple logo — Gamma Plus
Laptop Sleeve for Newest 15 Inch MacBook Air & 16 Inch MacBook Pro M2 – Comfyable
Leather Sleeve for 15-inch MacBook Air (M2)
Mosiso 5 in 1 New MacBook Pro 13 inch Case 2016-2020 Release A2338 M1 A2289 A2251 A2159 A1989 A1706 A1708, Hard Shell Case&Sleeve Bag for Apple MacBook Pro 13'' with/without Touch Bar
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MacBook 16 & 15 Inch Leather Sleeve - SANDMARC