We used it for all of our sleeping bags pillows and a medium hard case suitcase. 00 for them. The other Chinese IEMs I have are KZ ZS10 Pros, these are really good with several drivers, the treble is a bit splashy on them, theyre superb for the money, but I do prefer the Blons. Im usually not quite a wide but a lot of M are too narrow for bunions. 5 MM adapter and optical cable included. I have bought 4 of these cases for myself, family, and friends and have had zero problems until this last one where the double stick tape refused to adhere to the case. Recommend you pull up YouTube video for installation— it was very helpful. This particular model fits me like a medium rather than a narrow. 40 (bluetooth)Sennheiser HD 350BT (bluetooth)Anker Soundcore Life Q20 (bluetooth) Ive owned the ghost 10/11 previously and these are at least equal if not more comfortable.