Assuming that Vaude named the Wizard 18+4 after the English word for wizard or sorcerer, there must be something to it. And indeed, there is! A lot, in fact: The "+4" in the name of the Wizard 18+4 refers to the additional volume in liters that can be added to the base volume of 18 liters via a zipper that runs around the pack. The length of the shoulder straps, and thus the back length, is also adjustable. These can be individually adjusted via a Velcro fastener on the back panel from size S to XL. The same applies to the mesh ventilation of the daypack. Depending on the ventilation needs and desired packing volume, the back panel can be shaped to allow for either more ventilation or a closer fit to the body. The front pocket of the backpack spans the entire area and provides additional storage space. The rain cover is conveniently stored in a bottom compartment, but the material is already water-repellent, keeping out a few drops. Thus, the Wizard 18+4 from Vaude is a great companion for day hikes with minimal luggage, traveling, or even a trip to the lake.