I will have to pick up a pack of these and try them out. I have several Stanley and Kobalt versions in tool bags and in my vehicles. Seems like a nice price point even if they only hold up half as long.
No spare blade, but you can flip the blade for a second edge, and switch it to a regular utility knife when you get home. When I was working in college, I carried a utility knife alongside a locking folder. Not until the leather man wave come out did I drop the utility knife for a wave. After 9/11, I stopped carrying more than one knife- I fly way too much. I keep one of the folders on a lanyard In my suitcase ( never carried on board) for use when traveling- if nothing else to cut cable ties on cases holding real tools.Harbor Freight sells them for $6. I have one and like it as well as I like the Kobalt version. The biggest drawback to these knives is that they have no way to carry spare blades. With a diamond sharpener its easy to put and edge back on them.