• Totex Balloon
• string/cord
• cable ties
• payload cord

Once the balloon is filled tie a piece of string around the neck (above the still attached filler) tighten and then tie the other end of this string to the top of the helium tank. This will act as a safety line in case of a sudden gust of wind etc.

Above the string use one cable tie (a small one would probably be best) and tighten as much as possible. Do the same with a cable tie below the safety line. Try to keep them relatively close together so that there is still some excess balloon neck below.

Now while one person holds the tied neck (preferably with gloves) remove the balloon filler. If possible tighten the cable ties. Now attach the payload cord directly below the lowest cable tie with a very strong knot. Next loop the excess neck round and using another cable tie attach it to top end of the neck. Add a second cable tie for a little more strength.

Now the payload chord should be attached at the bottom of the loop of neck and the balloon ready to launch. Don't forget to shorten the excess cable ties and remove the safety line (just cut the string near the balloon and leave the part tied around the neck of the balloon.