I want to cover my esc and reciever in balloons,but don't know the best way to secure them to the chassis once they have balloons on them.I usually use the double sided servo tape.If i put the tape on the balloons won't the electronics just bounce around inside them? Would small zip ties work better?

Try some zip-ties and see if that works.

Once the electronics are inside the balloons, try wrapping them with rubber bands. There is no reason I can think of that the parts should move inside the balloons... eh?

Most people use zip ties & I've never had a reciever or ESC bounce out of a rig when using them. Just be careful not to fully crank them down. It can be rough on the case.

Zip ties seem to be the favorite Thanx.