Detours Mighty Midge Bike Bag for $9.93. Select free ship to-store for in-store pickup at REI. Shipping is free on orders over $50. If needed, use this Filler Tool to pad the order to qualify for free shipping. Here is a screenshot for your reference. The Detours Mighty Midge Bike bag provides space for keys, cell phone, camera, snacks and more with attachment system that fits most stem or top tube on a bike. Most places have this Detours Mighty Midge Bike Bag for about $29.