Reddit reviews Geekria UltraShell Case for Sony WH-1000XM3, WH1000XM2, WH1000XM3, WH-XB900N, MDR1000X Headphones, Replacement Protective Hard Shell Travel Carrying Bag with Room for Accessories (Dark Gray)
We found 3 Reddit comments about Geekria UltraShell Case for Sony WH-1000XM3, WH1000XM2, WH1000XM3, WH-XB900N, MDR1000X Headphones, Replacement Protective Hard Shell Travel Carrying Bag with Room for Accessories (Dark Gray). Here are the top ones, ranked by their Reddit score.
Maximum compatible headphone dimensions (inside): 7.08 x 5.90 x 2.75 inches (18 x 15 x 7 cm)Engineered ultra-hard shell protects against drops, impacts or crushes.Internal mesh pocket conveniently stores cables, chargers, earpads, adapters, and other accessories.Case designed to fit Sony WH-1000XM2, WH-1000XM3, WH-1000XM4, WH-XB900N, MDR 1000X, MDR1000X/B, MDR1000X/C case. A good replacement or upgrade of original headphones case.If the Sony case doesn't fit or break within one year, Geekria will replace or refund. No question asked.
There is a Sennheiser brand one for the MB660s (exact same shape as the 550s) but from my cursory look I'm not entirely sure where to actually buy one. I have seen some recommendations for this Geekria brand one which is available from Amazon.
Geekria Headphone Case
This case offers solid protection and can fit the accessories for the PXC 550 as well. For me, it's perfect for commuting and travel.
Likely the easiest way to replace it would be to purchase a new one. After a quick Google search I found these links. Both platforms appear to have more than one listing for compatible cases. Does this help?
eBay: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F153142948252
Amazon: https://www.amazon.com/dp/B07BKBFTJF/ref=cm_sw_r_cp_apa_i_zoOjDbQMSVZNC
Sony $$: https://sony.encompass.com/model/SONWH1000XM3