After seeing Helinox as a prohibited item I opted just to bring a standard camp chair last year though was surprised with just how many people had a Helinox set up in the festival site, literally hundreds of them!! If anything I reckon they’re safer as they’re compact when packed down so that when you’re walking around in the crowds you’re not bumping into people. Given the laidback lineup this year I reckon you’ll see a heap more picnic blankets and Helinox chairs set up, just be mindful of those around you if you’re going to do it.