Originally Posted by Seeker
SCBA (self contained breathing apperatus) is in practical due to smaller (known as escape units) only hold 5 minutes of air while larger units are heavy and with higher levels of physical work (like riding a bicycle) you will find the air tank empty sooner.
it was a joke (G) but hey mabye we can make bicycle tubes into the compressed air tanks. then if you get hit by a car mabye you can take them out too (G)