The AirPods Max Smart Case is a bit of a mystery. Do you need it on at all times to save battery? Do you need to carry it around eveywhere?
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Maximum compatible headset dimensions (case inside): 8.4 x 7.6 x 2.3 inches. Compatible with many wired / wireless headphones. Engineered ultra-hard shell protects against drops, impacts or crushes. Soft inner maximize headphones protective in the case. Internal mesh pocket conveniently stores cables, cords, chargers, AMP, earpads, adapters and other accessories.
Geekria Shield Headphones Case Compatible with AirPods Max Case, Will Make Headphones Into Sleep Mode Immediately, Replacement Hard Shell Travel
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