An Italian airport is allowing passengers to turn up the volume — making an exception to its liquid limit on airplanes, provided the item is pesto sauce.

Over 500 jars of the basil spread have passed through Genoa’s Cristoforo Colombo airport in the weeks since it launched its “Il pesto è bueno” (pesto is good) initiative on June 1.

The initiative allows passengers to hold on to their jars — provided they make a donation to Flying Angels, a foundation that flies sick children to other countries for treatment, according to BBC.

Donations can be as low as $0.55, but the airport says many are donating more, and that 20 days after the initiative started, they’d already received over 500 Euros, or $557, in donations.

Airport representatives said the idea came to them after “hundreds of jars that were seized in airport security checks.”

This article originally appeared on The New York Post.