Win some goodies from The Riddler!

Can you solve the riddle below?

Everyone has me but nobody can lose me. What am I?

If you can, you could be the proud owner of our System Filter and Chemical Pack. We’ve two to give away. A further five riddlers will each receive a goodie bag which contains an Intergas-branded T-shirt, T-bar, pen and notebook, water bottle, drawstring bag, lanyard and heatex comb.

Just send your answer to: Please type RIDDLE in the subject box and state your T-shirt size (S, M, L, XL, XXL, XXXL) and delivery address on your email. The first two randomly selected correct answers to reach us will win the System Filter and Chemical Pack and the next five a goodie bag.