You really have to add some info. Do you want:
Fixed blade or folder?
Do you ultralight backpack and how concerned are you with the weight of the knife?
Do you want the knife for general stuff or are you going to bushcraft?
Do you anticipate to skin game or fillet fish?
Will this be the only tool you bring or will you have other tools, knives, axes etc?
Do you have a price range in mind?
The more information you give the better direction we can give. For example if you are only going to use the knife to open food packages and maybe a little whittling then a SAK is fine. Light weight easily packable and decent quality. However if you plan on fishing for your dinner some nights and need a knife to fillet fish then a SAK is probably not what you need.