Swiss-Army knives are available with more and less features. At a minimum, knives are useful for first aid, food preparation, cutting moleskin strips, cutting rope and making repairs. If you don't actually use a feature, then you probably don't need to be carrying it around. Keep these matches separate from your regular match or butane lighter supply. Keep them available for emergency situations.
Fire starters are useful for quickly starting a fire, especially in emergency situations.
They are also useful for igniting wet wood. Carry plenty of fresh water. If you are familiar with the area in which you are traveling, and can be sure that water sources are available, carry enough water to get you there. If you aren't bringing your water from home or a public source, treat the water you draw from the backcountry, regardless of the source. These days, everything is suspect.