My 5 are 1. Knife - Gotta have it 2. Scissors - Gotta have em. People friendly. Good for precise cutting in hand. Grooming. 3. Awl - The awl is like a strong tip of a knife. I use the awl to preserve my knife's edge. It opens boxes, mail, lightly prys things, strikes firesteel, carves wood, and stabs holes. It can replace the bottle opener too. Bottles are really easy to open without an opener. 4. Combo Tool (flat head, can opener, bottle opener) - screws, beer, tuna 5. Phillips - screws. Could possibly replace the need for an awl? Honorable mention - Magnifying glass - Fun. emergency fire? I have bad vision so I like this feature.