for Apple AirPods Max Case Accessory: WIWU AirPod Max Case with Sleep Mode | Airpod Max Accessories for Apple Headphones | Ultra-Slim Travel Carrying Case | Portable Storage Bag | Fits 1st & 2nd Gen

It does not support the sleep function and is designed for you to use the bra case inside of this case, so it's not very form fitting. If you look on Amazon's site, you'll see it's "frequently returned due to large fit". I was eyeing this one up to when I was looking for a case. I ended up with this one, which seems to work well and has the sleep function built in: https://www.amazon.com/dp/B093KXHTND

If you want a slim one then https://a.co/d/0i6Qlows But there are plenty out there