You'll find that most preassembled kits have been put together through much feedback given by those who have experienced injury during a crisis. Some basic first aid essentials include gauze, tape, adhesive strips, scissors, antibiotic ointment, bandages, burn treatment bandages or lotions, rash or itching creams, thermometer, arm splint, tweezers, safety pins, pain reliever, prescription medications, antiseptic towelettes, ammonia inhalant, instant ice packs, sponges, eye washes, rubbing alcohol, etc. Although pre-assembled kits contain the most common items needed during emergencies, it's important to gather items that fit your particular needs. Prescription medicines such as medicines for asthma, diabetes, high blood pressure, depression etc. are crucial for first aid kits. Also be sure to include special items needed by small children or the elderly.
Kits come in all sizes and range from just basic items to professional surgical kits.
First, determine what items you will need the most and how much you will need for each item. For example, families with small children will probably need extra bandages and items for scrapes and cuts. Second, you should purchase a kit that contains items that best suit your needs. It's useless to have a professional kit that contains items you don't know how to use, or to have a kit that is to basic to treat emergency needs. You should keep a portable first aid kit in your 72 hour kit.