Hi Castaway,<br>Please do NOT use 550 cord to rap from. Every knot you tie in the line reduces its strength 20 -30%. Add to that the bends over the windowsill and around your friction device and youv'e got a problem. In addition you'll find that you will not be able to create enough friction with that small a diameter for a controlled descent. <br>I have a bailout kit that's made from 5.5 mm cord. I don't carry it anymore, in favor of 8mm. The 5.5 cord is just barely adequate for this purpose.<br>JB<br><br>Expect poison with the standing water.<br> -William Blake