Fly Bundles Quantity Breaks

DO NOT USE IT. EVER !! Unless you want to loose time and deal with extremely incompetent people.
They are the WORST. They made mistakes on purpose to cause me trouble such as, making the custom field not responsive in the back end etc... They blackmailed me, and threatened me live on a google live and they assured they would not provide any support, while their app was FAULTY. I had to call shopify support to sort things out twice. Extremely rude and not helpful. The worst I've ever used on the shopify app store.