I really like the BACtrack Carrying Case! It is very well made, attractive, and discreet (no big advertising logos). I especially appreciate that it is grey, rather than all black, so I don't lose it in dark spaces. It is perfectly sized to neatly, and safely, hold the Bactrack, a small ziploc of mouthpieces (this comes in the 50 pack bag of mouthpieces they sell...SMART!), a fold of bills, AND a DL & Credit Card can zip right in there too (still enough space for a condom...)! Easy to throw in my pocket or purse wherever I'm going. You NEED this. Sometimes you don't know what you want until you have it. Don't look BAC...buy NOW! (Not a paid party! Just a BACker!)