paintballs and the cold
try and get some thermal boxes if you are taking your own paint, as adverse temps can make the balls brittle and are prone to bursting in your barrel, we constructed some from 1" polystyrene, which you can buy from b&q get the foil lined stuff, keep the paint in room temp for a day and take to the tournies in the box or heater bag, keep the lid on and dont expose the paint to the atmosphere for too long, if potted keep the post warm also,
if your paintballs are dimpled there useless, and will not be very accurate. or if you are buying from the venue make sure they are supplying warm paint.