Propel® Instant Powder Packet, 0.08 oz, 16.9 to 20 oz Yield, Berry ORS NASCO Features a lightweight vulcanized fiber Features a lightweight vulcanized fiber shell for comfortable yet cool Exhalation valve HandyStrap® with buckle allows mask to comfortably hang around neck when not in use Soft foam face cushion eliminates pressure points for added comfort Ventex® valve lets the hot air out faster so workers breathe easier and use fewer masks individual packets contain the same level of electrolytes as Propel unflavored water plus Vitamin C and Vitamin E They have enough electrolytes to replace what you put out and keep you moving Simply pour powder into your water mix and drink to refresh yourself