All water is not created equal! Here at Survivor Industries we have spent years perfecting our Mainstay™ Water Packets. The final result is a portable product with a five-year shelf life. Other Key Benefits: U.S. Coast Guard Approved No Oxygen Transfer (In other words, no chance of bacterial contamination) Pre-Measured Packets make the water easy to dispense, and potential for loss is minimized. If a packet is destroyed, only 4.224 ounces (125 ml) would be lost. Easy to Transport - just 18 lbs. (8.17 kg) per case of 60 packets. No special storage required - it can withstand temperatures from (-40°F to 210°F) (-40°C to 99°C). Very Low Cost. No Cups Needed!