Richoa said..
God must be on my side as I've already pumped it up once that I know of and not sure if other times and no balloon or bomb. Must of been lucky.
Well sort of. You were only lucky most likely because the under-zipper flap was in place. That's the piece of vinyl or plastic that goes flat between the zipper and the bladder. It's there to prevent any punctures from the plastic bits of the zipper damaging your bladder. Hence why when you open that zipper, make sure that flap bit is back in place, flat and fully covering the area away from the zipper.
Here's a tip. If you're out travelling and the zipper itself pops out, you can use the flap to hold it all together with a bit of string and a needle (yeah I carry a repair kit every time I go out), and just do a simple zig-zag around the zipper a few times. Deflate first of course. AT least the kite will hold until you get that zipper repaired.
