A first aid kit is a collection of medical supplies and tools used to treat minor injuries and stabilize serious ones until professional help arrives. Most household kits contain 15 to 25 items covering wound care, pain relief, and basic protective equipment. Whether you buy a pre-assembled kit or build your own, knowing what belongs inside (and why) helps you respond quickly when someone gets hurt.
What a Standard Home Kit Contains
The American Red Cross publishes a recommended supply list for a family of four that serves as the baseline for most home first aid kits. It includes 25 adhesive bandages in assorted sizes, two large absorbent compress dressings, a roll of adhesive cloth tape, sterile gauze pads in 3-inch and 4-inch sizes, and two roller bandages for wrapping wounds. Two triangular bandages round out the wound care supplies; these work as arm slings or can secure splints.
Beyond bandages, the Red Cross list calls for five antibiotic ointment packets, five antiseptic wipes, two packets of low-dose aspirin, two hydrocortisone ointment packets, an instant cold compress, and an emergency blanket. Protective gear includes two pairs of nonlatex gloves and a breathing barrier with a one-way valve for performing CPR without direct mouth contact. A non-mercury oral thermometer, tweezers, and a printed first aid instruction guide complete the kit.
This list is a starting point. Most families benefit from adding a few over-the-counter medications: a pain reliever like acetaminophen or ibuprofen, an antihistamine for allergic reactions, calamine lotion or hydrocortisone cream for insect bites and rashes, and antacid tablets for stomach discomfort. If anyone in the household has severe allergies, an epinephrine auto-injector prescribed by a doctor belongs in or near the kit at all times.
How Each Supply Type Works
First aid supplies fall into a few functional categories, and understanding them helps you avoid grabbing the wrong item under pressure.
Adhesive bandages cover small cuts, blisters, and scrapes. They keep dirt out and hold the wound edges together while healing starts. For larger wounds, sterile gauze pads absorb blood and fluid, and you secure them with adhesive tape or a roller bandage.
Elastic wrap bandages provide compression and support for sprains, strains, and swelling in joints like ankles, wrists, and knees. They’re different from roller gauze, which is primarily for holding dressings in place over open wounds.
Triangular bandages are surprisingly versatile. You can fold one into a sling for an arm injury, use it as a tourniquet-style pressure wrap, or tie it around a splint to immobilize a suspected fracture.
Antiseptic wipes and antibiotic ointment serve different purposes. Wipes clean the wound and surrounding skin before you dress it. Ointment goes directly on the wound to reduce the chance of bacterial infection as it heals.
Workplace Kits Follow Stricter Standards
If you’re stocking a kit for a business, the relevant benchmark is the ANSI/ISEA Z308.1-2021 standard, which defines two classes. Class A kits cover common workplace injuries: adhesive bandages, antiseptic, burn dressings, burn treatment, cold packs, eye coverings, eye and skin wash, roller bandages, trauma pads, scissors, sterile pads, exam gloves, hand sanitizer, a breathing barrier, triangular bandages, and a first aid guide.
Class B kits contain everything in Class A but in larger quantities, and they add two items not found in Class A: a splint and a tourniquet. Class B is designed for higher-risk environments where severe injuries are more likely, such as construction sites, manufacturing floors, or warehouses.
Kits for Your Car
A vehicle kit overlaps with a home kit but adds tools specific to roadside emergencies. The National Safety Council recommends pairing standard medical supplies with reflective triangles, a brightly colored cloth to increase your car’s visibility, a flashlight with extra batteries, jumper cables, a multipurpose utility tool, a fire extinguisher, and a blanket. Nonperishable high-energy foods like unsalted nuts and dried fruit, drinking water, and a car charger for your phone round out the kit. In colder climates, add warm clothing, a snow brush, a shovel, and cat litter for tire traction on ice.
Kits for Hiking and Remote Areas
Wilderness first aid kits address a problem home kits don’t: you may be hours from the nearest hospital. That changes what you pack. A SAM splint, which is a lightweight, waterproof, reusable splint for immobilizing broken bones, becomes essential. Elastic wraps (4 to 6 inches wide) provide compression for sprains and help secure improvised splints. Safety pins are useful for fastening bandage materials or pinning clothing into a makeshift splint.
Moleskin is a must for hikers. It reduces friction against blisters and can be cut into custom shapes for fingers or toes. Triangular bandages pull extra duty in the backcountry as slings, swathes, and compression wraps. Because wilderness injuries often involve waiting, carrying a larger supply of gauze, adhesive tape, and pain relievers than you would for a day at home makes sense.
What to Add for Babies and Young Children
Standard kits are built for adults. If you have an infant or toddler, a few specialized items make a real difference. A rectal thermometer is the most accurate way to check a baby’s temperature, and petroleum jelly makes using one more comfortable. A medicine dropper or oral syringe ensures accurate dosing of infant acetaminophen, which is safe for babies over 2 months old for mild fevers and aches. Always use the infant-specific version, not the children’s or adult formula.
A nasal aspirator paired with saline drops clears congestion, since babies can’t blow their own noses. A classic bulb syringe handles everyday stuffiness, while a stronger suction device works better when a baby is actively sick. Gas drops help with post-feeding fussiness or colic symptoms. Baby nail clippers belong in the kit too, since infant fingernails grow fast and babies frequently scratch their own faces. Cold packs sized for small bumps and bruises, along with a written list of emergency contacts including your pediatrician and local poison control number, complete the setup.
Supplies Expire, and It Matters
First aid kits aren’t a set-it-and-forget-it item. Many supplies lose effectiveness over time, and sterile items can degrade if packaging is compromised. The Red Cross provides these shelf-life benchmarks:
- Alcohol wipes: 2 years
- Antibiotic ointment: 2 years
- Burn ointment: 1 to 2 years
- First aid creams: 2 years
- Sterile eyewash: 3 years
Check your kit every six months. Replace anything expired, restock items you’ve used, and make sure packaging on sterile supplies like gauze pads hasn’t torn or gotten wet. Medications like pain relievers and antihistamines have their own expiration dates printed on the box. If adhesive bandages have lost their stickiness or gloves feel brittle, replace them regardless of their printed date.
Buying Pre-Made vs. Building Your Own
Pre-assembled kits are convenient and typically cheaper per item than buying supplies individually. They come in cases sized for specific purposes: home, car, travel, or office. The tradeoff is that many commercial kits include bare-minimum quantities or lower-quality versions of key items. A kit with five tiny adhesive bandages and two alcohol wipes technically qualifies as a “first aid kit,” but it won’t get you far.
Building your own kit lets you match supplies to your household’s actual needs. A family with young children can include pediatric items. Someone with a known allergy can keep an auto-injector and antihistamines front and center. A good approach is to start with a pre-made kit that covers the basics, then supplement it with the specific items your situation calls for. Store the kit in a clearly labeled, water-resistant container, and make sure every adult in the household knows where it is.