A lot of people like the multi tools. These of course offer lots of options. Some useful tools typically found on these are: a knife, scissors, tweezers, screwdrivers, toothpicks, pliers, can openers, and awls. The multi tools come in quite a few different sizes and weights. They also come with a variety of tools in them, so you have to be sure and read about each one to be sure it has all the tools you require. I have even read about a credit card multi tool. Some other things to think about is how are you going to carry the knife? Do you want to clip it to your shoulder strap, or just simply slip it inside your pocket? Do you want to clip it to your pocket? Also, keep in mind some of the sheaths that come with some of the knives. Some are made of a hard plastic, while others are made of leather. Size of the blade must also be taken into consideration. What will you need the knife for? Just for opening meal packages or maybe cutting some rope every once in a while might warrant a small tiny blade.