I ordered the Dignis Airpods Max pouch direct from Dignis:
DIGNIS AIRPODS MAX POUCH - DIGNIS (cafe24.com)
Gif and cut-away showing how the APP is stored in the case
They're reasonably priced at $70 USD though DHL shipping from S. Korea to USA is $20.
Overall these aren't much more than other cases in the $99-100 price range.
If you're not familiar with Dignis - they're a very well know and regarded case brand for IEMs and DAPs (Hi-Res digital audio players). Unique Melody includes a custom Dignis Arca leather IEM case with their MEST MkII.
Dignis Airpods Max pouch arrived yesterday evening and apologies for the poor quick photos:
Quick take aways - material is not leather but padded water resistant rigid case, synthetic leather and trim, with breathable mesh fabric lined interior.
Headband doesn't need to be adjusted to fit as case flap adjusts and provides a secure magnetic attachment - there are 4 magnetics. The charging port cut out is perfect. Case also makes for a great stand. There's a slim pouch on the back for storing cables.