I always lock my cutter now, even at home. When going to a class or sewing meet, I take my tray that is always next to my sewing machine. It is a Tupperware Modular Mate rectangle one: a box about 7" X 10" by 2" high. With that cover on, everything is quite tight in there. I have a bobbin donut with a pin cushion in its center, and the other stuff I need all around. My cutter fits as well as 2 pair of scissors. Most used presser feet and a few skewers are always handy.