Sweet, Gas Caryophyllene, Limonene, Myrcene, Nerolidol Blue Zktlz x Jet Fuel Gelato The Backpackers pre-rolls by Back Forty are straight cut pre-rolls, perfectly packed and rolled in hemp paper for a smooth and steady burn. They're housed in a water resistant resealable tin. Liquid Imagination is a potent hybrid that's a cross between Blue Zktlz and Jet Fuel Gelato. It's sweet and sour with a touch of gas.