Darren drum inside a regular tackle sack?http://www.ebay.co.uk/itm/Plastic-Barrels-Keg-Drum-with-Screw-on-Lid-Airtight-Watertight-Food-Grade-NEW-/263045459164
Thanks I like the idea of a rocket tube, but local army surplus store closed recently so will have to travel a bit to find a decent store to rummage in. Drum in a suitable bag seems like a good option at the moment, anyone got any other suggestions?