Big-Bore Tethering Regulator Owners - What Type of Case Do You Store Your Reg In?

I've been trying to find a compact hard case to transport my external regulator in when in my range bag. If you own an external 5000psi or higher external tethering regulator, what type of case are you storing you regulator in? Please be descriptive and provide links to the case if you have one. Mine is similar to the one pictured below, but sold by another company.
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