If you’re planning to go see U.S. pop star Ariana Grande perform live in Vancouver, you might want to take note of an entrance policy—as what you carry with you may preclude you from being admitted.

The singer will be performing at Rogers Arena on Saturday (April 27) on her 2019 Sweetener World Tour, in support of her fourth and fifth albums Sweetener and Thank U, Next.

However, Rogers Arena stipulates on its website that attendees are only permitted to carry a maximum of one bag. Furthermore, all bags must be 100 percent clear, and made of clear plastic, vinyl, or PVC.

There is also a size restriction: bags cannot exceed the dimensions of 12 inches by 6 inches by 12 inches.

Alternately, fans can carry a one-gallon resealable clear freezer bag (such as a Ziploc bag).

All items must be placed in the clear bag and cannot be contained inside of additional bags within the clear bag.

Anyone with a medically necessary item will be permitted after an inspection at a designated gate.

In addition, cameras and recording devices are also banned, with the exception of cellphones with cameras.

The policy has been in place for Grande’s tour, which began in New York on March 18 and will wrap in Europe in October.

The requirements for entry follow after a suicide bombing took place at Grande’s concert on her previous Dangerous Woman tour in Manchester, U.K., on May 22, 2017. The deadly attack resulted in the deaths of 23 people and 139 people were wounded at the event which saw 14,200 people in attendance.