Festival-goers are being urged to pack a simple £1 item.

Green Man Festival is set to take place this weekend in the Bannau Brycheiniog National Park, and attendees are being reminded to bring electrolyte sachets to help them stay hydrated.

Nick Hird, a hydration expert at Vidrate, said: "One way you can help to lessen the effects of dehydration from drinking alcohol is to supplement your consumption of alcohol with electrolyte powders.

"When you........

© South Wales Argus