The ones I carry in my site pack come bagged in quantities of 5 per bag. I leave the bag sealed and put it in my pack. Keep them in a pocket away from any heavier items and at least a couple should survive in good condition being carried this way. The benefits are that you don't incur added expense/weight of a container and you have 5 masks that could all be used in a pinch if you need them. Unused masks can be resealed in a carefully opened plastic bag for future needs.