Most passes you join will be packed in finger bags, so as long as you put them in there in good shape, you should be fine. Best way to ship safely but the smaller ziplocs work fine too, just with any naked stick you have to minimize movement in the box. You will probably end up leaving cello on most of your sticks if you become active in passes-trades-etc.
Haha, I said minimize the movement of your naked sticks.....