This Apple-designed leather sleeve (part number MTEJ2ZM/A) is made for the 15.4-inch MacBook Pro. Apple described the sleeve:
“The black Apple Leather Sleeve is designed for the Apple 15.4-inch MacBook Pro. The sleeve is made of European leather with a soft microfiber lining.”
Apple adds that “The design of this sleeve allows you to charge your 15-inch MacBook while keeping it protected.”
On September 12, 2023, Apple announced that they would end “the use of leather across all of its product lines.” Lisa Jackson, Apple’s vice president of Environment, Policy, and Social Initiatives, said: “At Apple, we have a longstanding and proven commitment to leading the fight against climate change. Our focus on renewable energy and low-carbon design has already driven industry-leading emissions reductions, and we’re not slowing down.”
Source: Apple