Few trips require as much pre-departure planning as Hawaii — not because packing is especially complex, but because the islands have legal restrictions on what can enter, cultural context that shapes what to wear, and a retail environment where some items cost twice the mainland price while others are readily available on arrival.
This guide covers what actually matters: the reef-safe sunscreen requirement, what the Department of Agriculture prohibits at the airport, and what you can comfortably buy after landing rather than shipping from the mainland.
The Reef-Safe Sunscreen Requirement
Hawaii enacted Act 104 in 2018 (codified at Hawaii Revised Statutes § 342D-21), which prohibits the sale and distribution of sunscreens containing oxybenzone or octinoxate. The law took effect January 1, 2021.
In practical terms, many standard US drugstore sunscreens are banned from retail sale in Hawaii. Enforcement targets retailers, but reef-safe sunscreen is both the legal standard and a cultural norm residents take seriously — coral reef protection is a frequent public health topic across all the islands.
Reef-safe alternatives use mineral blockers: zinc oxide or titanium dioxide. Brands widely used by residents include Thinksport, Raw Elements, Stream2Sea, and All Good. These are available at Hawaii grocery stores and pharmacies, typically at a premium over mainland prices. Packing enough reef-safe sunscreen for the full trip is worth doing before departure.
Clothing: What Actually Works in Hawaii’s Climate
Hawaii’s climate varies significantly by island and elevation:
- Sea level (Honolulu, Waikiki, Kihei, Kailua-Kona): Warm year-round, roughly 75–88°F. Light cotton or moisture-wicking fabrics work well.
- Windward coasts (Kailua, Kaneohe, Hilo): Humid with frequent short rain showers. Quick-dry fabrics are practical.
- Upcountry (Kula, Waimea, Volcano Village): Cooler — low 60s°F at night in many areas. A light layer is worthwhile.
- Mountain summits (Mauna Kea, Haleakalā): Cold — mid-30s°F at the peak. If summit visits are planned, warm gear is required, not optional. Visitors have been turned away from Mauna Kea for arriving underdressed.
A practical clothing haul for 7–10 days:
- 5–7 lightweight tops (linen, cotton, or technical fabric)
- 2–3 swimsuits — rotating between beach days is standard; damp suits are uncomfortable and hard on skin during extended sun exposure
- 1 rashguard — provides significant UV protection and acts as a physical barrier against jellyfish in some swim areas; widely worn by residents rather than being a tourist marker
- Water shoes or reef shoes — coral and lava rock are rough on bare feet at many access points
- 1 nicer outfit for any restaurant requiring “resort casual” — most upscale Hawaii restaurants use this dress code rather than requiring formal attire
- A packable rain jacket or light windbreaker — useful on the windward side and for Haleakalā sunrise visits
On aloha attire: aloha shirts and resort-print dresses are genuinely worn in Hawaii for professional and social occasions, not just by tourists. For business events and many nicer restaurants, “aloha attire” is the standard dress code rather than business casual.
Beach and Water Essentials
- Reef-safe sunscreen (see above)
- Rashguard: Provides SPF 50+ coverage for extended water time; a standard piece of gear for residents.
- Water shoes: Essential for rocky shores, tidal pools, and lava-field coastal access. Black sand and black rock beaches like Punalu’u on the Big Island are striking but hard on bare feet.
- Dry bag or waterproof phone case: Many Hawaii activities involve spray or shallow water. Small dry bags (packed flat) are practical for boat tours, kayaking, and waterfall hikes.
- Snorkel set: Available to rent at most beach access points for $10–20 per day. Buying a quality set on the mainland ($30–60) is cost-effective for trips of five or more days with multiple snorkel sessions planned.
What Is Cheaper to Buy After Landing
Some items are readily available and reasonably priced in Hawaii, making pre-trip packing unnecessary:
- Local produce: Farmers’ markets on each island sell fresh tropical fruit at competitive prices. There is no reason to bring packaged tropical fruit from the mainland.
- Grocery staples: Costco operates on Oahu, Maui, Kauai, and the Big Island. Prices are mainland-comparable for bulk items. The Costco Hawaii guide covers which categories are worth stocking up on.
- Basic clothing and forgotten items: Target operates on Oahu and Maui. ABC Stores (throughout tourist areas), Walmart (Oahu), and major drugstores cover most incidentals.
Items genuinely more expensive in Hawaii compared to the mainland: branded packaged foods, reef-safe sunscreen (as noted above), gasoline, and most vehicles.
Biosecurity: What the Department of Agriculture Prohibits
Hawaii’s geographic isolation — approximately 2,400 miles from the US mainland — makes it one of the most ecologically distinct environments in the country. The Hawaii Department of Agriculture (HDOA) Plant Quarantine Branch enforces agricultural quarantine rules at all arrival points to protect native ecosystems from invasive species.
Items that cannot enter Hawaii without permits or inspection include:
- Most fresh fruits and vegetables from the US mainland
- Live plants, soil, and plant cuttings
- Fresh cut flowers (some exceptions apply with proper inspection certificates)
- Seeds of regulated plant species
- Certain animals — Hawaii has strict prohibitions on snakes, some reptiles, and other species not native to the islands; see the prohibited animals guide for the full list
Items that are unrestricted: Manufactured and packaged food products, clothing, books, electronics, and standard sporting equipment travel without issue.
HDOA inspectors conduct bag checks at Honolulu International Airport arrivals. Undeclared restricted items are confiscated, and penalties can apply. The arrival declaration form on Hawaii flights asks specifically about food, plants, and animals — accurate completion is required.
Moving to Hawaii vs. Visiting: A Different Calculation
Visitors pack light with a finite timeline. People relocating to Hawaii face a different set of decisions: most mainland household items can be shipped, but container and air freight costs are significant (see the container shipping guide for cost benchmarks and what the process involves).
Items generally worth shipping when moving permanently:
- Specialty tools and trade equipment
- Quality cookware and small appliances without ready Hawaii equivalents
- Books, instruments, and personal keepsakes
Items often better sold before departure and replaced in Hawaii:
- Bulky furniture — shipping costs frequently exceed replacement cost for common pieces
- Cold-weather clothing — minimal utility in Hawaii’s climate year-round
- Older vehicles that may not meet Hawaii emissions standards
The what-to-sell-before-moving guide covers the full moving framework, and the car shipping guide compares Matson and Pasha for vehicle transport costs.
Airline Baggage Policies on Hawaii Routes (2026)
Baggage policies vary meaningfully between carriers operating Hawaii routes:
- Southwest Airlines: Allows two free checked bags per passenger — the only major carrier on Hawaii routes to do so. This makes Southwest meaningfully less expensive for heavier packers when fare differences are not significant.
- Hawaiian Airlines: Standard fees for checked bags; inter-island flights on Hawaiian operate under a separate fee schedule from mainland routes.
- Alaska Airlines, American, United, Delta: Standard checked bag fees apply. Co-brand credit card holders and elite status members typically receive free first checked bags under each carrier’s standard policy.
Airline fee structures change frequently. Verify current fees directly with each carrier before booking. The standard carry-on allowance (one carry-on bag plus one personal item) applies on most Hawaii-route flights for economy passengers.
What to Leave Behind
- Heavy toiletries: Most hotels and vacation rentals provide basics. Full-size bottles add weight with no practical gain for most trips.
- Cold-weather gear (unless summit visits are planned): Coats and heavy layers have no use at sea level. Rent or borrow summit-specific warm gear for Mauna Kea visits if needed.
- Prohibited agricultural items: As described above. Mainland fruit, plants, and soil must stay on the mainland.
- Excessive footwear: Most Hawaii days require flip flops or water shoes at the beach and one pair of clean casual shoes or sandals for restaurants. Add trail runners if hiking is planned.