went to Rolling stones concert apparently my bag w...

went to Rolling stones concert apparently my bag was too big ! but on entering stadium there were people with rucksacks bags A4 size etc. If you are going to follow instructions on bag size make sure all staff follow same rules as this causes people to get upset and feel picked on ...... it wasn't as if the bags were a little bigger than A5 the ones let in were huge.
Quite disgusted is was not a fair system at all !! Very disappointed.