Do I need a heavy jacket?

No. Even in the 'winter' months, the regions remain humid and warm. A light fleece or long-sleeve linen shirt is sufficient for air-conditioned buses or boats.

Only if they are under 100ml. However, I recommend buying sunscreen and shampoo locally to save space and weight.

Packing for a Month in Mexico and the Caribbean

Stick to a 40-liter backpack to avoid checked bag fees and mobility issues on ferries or cobblestone streets. Focus on moisture-wicking fabrics and a minimalist approach that relies on laundry cycles every 7 days.

Select the right bag. Use a 40-liter carry-on sized backpack. Anything larger will be a burden when navigating sandy beaches or crowded local buses (colectivos).
Master the packing cube system. Use three cubes: one for tops, one for bottoms, and one for underwear/socks. This keeps your bag organized during security checks and transit.
Limit footwear. Bring only two pairs: one comfortable walking sandal (like Tevas or Birkenstocks) and one pair of lightweight breathable sneakers. Do not bring heavy hiking boots unless you have a specific mountain expedition planned.
Choose your fabrics. Bring merino wool or synthetic blend shirts. Cotton holds moisture and takes forever to dry in the humid Caribbean climate; synthetics dry overnight.
Plan for laundry. Pack for exactly 7 days. Plan to use local 'lavanderías' once a week. They are cheap (usually $5-$10 USD) and return clothes folded and clean in 24 hours.

Do I need a heavy jacket?: No. Even in the 'winter' months, the regions remain humid and warm. A light fleece or long-sleeve linen shirt is sufficient for air-conditioned buses or boats.
Can I bring liquids?: Only if they are under 100ml. However, I recommend buying sunscreen and shampoo locally to save space and weight.