Fans heading to Hong Kong’s Kai Tak Stadium for British rock band Coldplay’s coming concerts can bring in certain types of bottles, unlike previous practice, but are banned from carrying signs, the organiser has said.

Live Nation said fans attending the shows would be allowed to have plastic or silicone reusable bottles, or cups inside, but they must be empty and have a maximum capacity of 600 millilitres (20.3 fluid ounces).

Kai Tak Sports Park on Monday clarified that these bottles must also come without lids.

Disposable plastic, glass or thermal bottles, as well as those bigger than 600ml, are prohibited.

During earlier events and trial runs, many people had to store their bottles on unstaffed racks placed outside the venue, while those who were unaware of the blanket ban held up the queues at security checks.

Many people had to store their bottles on unstaffed racks placed outside the venue during earlier events and trial runs. Photo: Nora Tam

Greenpeace also criticised Kai Tak Sports Park after the three-day Hong Kong Sevens rugby tournament generated about 860,000 disposable items.