I purchase this size for general usage. They don't seem to last as long in a storage situation as they used too but they aren't expensive so I still buy them.
Fold a bandana a few times loop a rubber band about 1/4 inch from each end and fold the ends over the rubber bands. Hold the folded ends so that the rubber band loops are extended. Loop the bands over your ears for a nice quick mask. Bandana and two bands .. really nice!