https://amzn.to/46IEffT Thule Aion 40L Backpack w/ Removable TPU Rolltop Bag (Dark Slate) on sale for $110.95. Additionally, you may earn 10% Back w/ purchase by using your eligible Amazon Prime VISA Card. Shipping is free. Thule Aion 40L Backpack w/ Removable TPU Rolltop Bag (Dark Slate) on sale for $110.95. Additionally, you may earn 10% Back w/ purchase by using your eligible Amazon Prime VISA Card. Shipping is free.