Do we need to pack separate bags or can we share one?

One checked bag plus two carry-ons works best. Sharing a checked bag saves airline fees and forces you to pack lighter. Keep 2-3 days of clothes in your carry-on in case the checked bag is delayed. Use different colored packing cubes so you're not digging through each other's stuff.

How many swimsuits should we each pack?

Three per person. One's always wet from the morning, one's drying from yesterday, one's clean for tomorrow. Swimsuits don't dry overnight in humid Caribbean air, even with air conditioning. If you're staying at a resort with pools and beach, you'll use all three.

Can we buy sunscreen there instead of packing it?

You can, but reef-safe sunscreen costs $25-35 per bottle at Tulum or Playa del Carmen shops. The same bottle is $15-18 on Amazon. Regular sunscreen is banned at cenotes and marine parks — guards will confiscate it. Bring two bottles from home.

What do we do about wet swimsuits and sandy clothes when we pack to leave?

Bring two gallon-size ziplock bags. Put wet swimsuits in one, sandy flip-flops in another, and pack them in an outer pocket of your checked bag. Most hotels will let you rinse gear in the bathroom sink before checkout. Don't pack wet things directly against clean clothes — everything will smell like mildew by the time you get home.

Should we pack snorkel gear or rent there?

Bring your own masks if you wear contacts or have fit issues — rental masks leak constantly. Fins and snorkels are bulky and rental is cheap ($5-10 per day). If you're doing one cenote trip and one reef trip, renting makes more sense than packing gear for two.

How dressy do we need to get for restaurants?

Beachfront and casual places accept shorts and sandals. Resort specialty restaurants and Tulum/Playa del Carmen nice spots want long pants for men and a dress or nice top for women. One outfit each is enough. You're not going to five-star restaurants every night.

How to Pack as a Couple for Mexico's Caribbean Coast

Pack light layers, swimwear, sun protection, and one nice outfit each in a shared checked bag plus two carry-ons. Mexico's Caribbean stays warm year-round (75-90°F), but you'll need coverage for air-conditioned spaces, mosquitoes at dusk, and occasional rain. Coordinating what you share versus pack separately keeps luggage manageable and gives you both what you need.

Divide roles before you start. Decide who packs shared items (sunscreen, bug spray, first aid, chargers) and who handles their own clothing. One person should own toiletries, the other beach gear and adapters. This prevents doubling up and finger-pointing when something's missing.
Choose one checked bag for both. A 26-28 inch spinner works for trips up to 10 days. Use packing cubes in different colors — one person gets blue, one gets green. Makes repacking faster and prevents the 'that's my shirt' moment. Keep 2-3 days of essentials in your carry-ons in case the checked bag delays.
Pack the base wardrobe. Each person: 3 swimsuits (one's always wet or sandy), 4 lightweight shirts, 2 shorts, 1 pair long pants, 1 sundress or linen shirt for nicer dinners, underwear for each day plus two extra, flip-flops, walking sandals, and one pair of closed-toe shoes. Everything should be quick-dry fabrics. Cotton takes forever in humid air.
Add the Mexico Caribbean essentials. Reef-safe sunscreen (required at cenotes and marine parks), insect repellent with DEET for evening, a packable rain jacket each, one rashguard each for snorkeling, a sarong or beach cover-up, and a dry bag for phones and cash on boat trips. Bring a reusable water bottle — you'll refill constantly.
Include one nice outfit each. Mexico's Caribbean has excellent restaurants. Pack one outfit you'd wear to a nice dinner at home. For men: long pants and a collared shirt. For women: a sundress or nice top with a skirt. Wrinkle-resistant fabrics. Most hotel rooms have irons, but you won't want to use them.
Handle tech and documents together. One person carries all chargers, adapters, and cables in a small pouch. The other carries passports, boarding passes, hotel confirmations, and copies of everything in a travel wallet. Mexico uses Type A and B outlets (same as US/Canada), but bring a power strip if you have multiple devices.
Pack a shared day bag. A 20L backpack fits sunscreen, water bottles, snacks, phones, a small towel, and your dry bag. You'll use this daily for beach trips, cenote visits, and ruins. It should fit under an airplane seat. Keep valuables in this bag, not the beach bag.

Do we need to pack separate bags or can we share one?: One checked bag plus two carry-ons works best. Sharing a checked bag saves airline fees and forces you to pack lighter. Keep 2-3 days of clothes in your carry-on in case the checked bag is delayed. Use different colored packing cubes so you're not digging through each other's stuff.
How many swimsuits should we each pack?: Three per person. One's always wet from the morning, one's drying from yesterday, one's clean for tomorrow. Swimsuits don't dry overnight in humid Caribbean air, even with air conditioning. If you're staying at a resort with pools and beach, you'll use all three.
Can we buy sunscreen there instead of packing it?: You can, but reef-safe sunscreen costs $25-35 per bottle at Tulum or Playa del Carmen shops. The same bottle is $15-18 on Amazon. Regular sunscreen is banned at cenotes and marine parks — guards will confiscate it. Bring two bottles from home.
What do we do about wet swimsuits and sandy clothes when we pack to leave?: Bring two gallon-size ziplock bags. Put wet swimsuits in one, sandy flip-flops in another, and pack them in an outer pocket of your checked bag. Most hotels will let you rinse gear in the bathroom sink before checkout. Don't pack wet things directly against clean clothes — everything will smell like mildew by the time you get home.
Should we pack snorkel gear or rent there?: Bring your own masks if you wear contacts or have fit issues — rental masks leak constantly. Fins and snorkels are bulky and rental is cheap ($5-10 per day). If you're doing one cenote trip and one reef trip, renting makes more sense than packing gear for two.
How dressy do we need to get for restaurants?: Beachfront and casual places accept shorts and sandals. Resort specialty restaurants and Tulum/Playa del Carmen nice spots want long pants for men and a dress or nice top for women. One outfit each is enough. You're not going to five-star restaurants every night.