One-bag packing list for two weeks in the tropics

Two weeks in the tropics, one bag, and daily rain

Two weeks in the tropics is a rain problem and a weight problem. Laundry is how you solve both. On 25 September 2026, Costa Rica's weather service forecast rain across the Pacific slope, the Central Valley, the north-central zone and the western Caribbean. ¹⁰ Pack for damp like that and the bag fills fast. Pack for AirAsia's 7 kg cabin allowance and it empties again. ²

Mist sits in the Monteverde cloud forest through the afternoon. Tayrona's entry rules stop disposable bottles, bags, cups, straws and cutlery before you reach the sand. ⁶ Every line on the list below answers one of those conditions, and each one has a source behind it.

The same list carries four trips: Costa Rica, Mexico's Yucatán, Colombia's three climates and Bali. What changes between them is the cabin rule on the smallest aircraft and the rules at each park entrance. Those two things set the weight ceiling, and the ceiling sets the list. ^{3, 2}

How much can one bag actually weigh?

Four carriers, read from their own baggage pages on 25 September 2026, against the empty weight of the bag itself.

The empty bag goes on the scale first. Aer's Travel Pack 4 35L weighs 3.90 lb, which converts exactly to 1.769 kg, and measures 54.5 x 34 x 23 cm at 35 L for $259. ¹ Every gram of that comes out of the airline's number before a single shirt goes in.

Weight is where these four trips separate. Wingo's Go Standard fare and above allow 12 kg in the cabin. ¹² Volaris allows 10 kg. ¹¹ AirAsia allows 7 kg for the backpack and the under-seat item together, or 14 kg with a paid upgrade. ² Sansa, which flies Costa Rica's domestic routes on small aircraft, allows 4.5 kg free for the entire cabin allowance. ³

What goes in the bag for two humid weeks?

Nine of these ten items come from a government page or a manufacturer's spec sheet. The tenth is a kitchen scale, because the only weight anyone publishes here is the bag's own 3.90 lb. ¹ Weigh your own kit against the ceiling in the table above, then cut from the heaviest end.

Four things decide a bag for these routes: it has to clear the published cabin dimensions on the budget carriers that fly them, weigh as little as possible empty because that weight is subtracted from your allowance, open flat, and be repairable. The Travel Pack 4 35L clears the first two on Aer's and the carriers' own published figures. ^{1, 11, 2}

• The bag: Aer Travel Pack 4 35L, 3.90 lb empty, 54.5 x 34 x 23 cm, $259, with a lifetime warranty against manufacturing defects. ^{1, 5}
• Long sleeves, long pants and a hat, the first line of CDC's bite prevention on all four countries' destination pages. ⁸
• Permethrin-treated clothing and gear, boots, pants, socks and a tent included, applied to fabric only. ⁸
• Repellent with 20% DEET or more, or another active ingredient on the EPA's list. ⁸
• A bed net, for any night sleeping exposed to the outdoors. ⁸
• A refillable bottle and a food container, because two of these four countries stop single-use plastic at the park entrance. ^{6, 7}
• Biodegradable or mineral sunscreen, recommended by Colombia's park agency and asked for by Quintana Roo's reef operators. ^{13, 14}
• A rain shell, in every month on Costa Rica's Caribbean side, where IMN records no defined dry season. ¹⁵
• Quick-dry layers in place of cotton, for a wet season BMKG expects later than normal across Bali. ¹⁶
• A kitchen scale at home, to weigh the packed bag against the tightest leg before the airport does it for you.

Weight and money trade against each other in both directions. Lighter gear costs more per gram, and MMT's cost of weight savings worksheet does that arithmetic for hiking kit. The same method works on a tropical list: price the gram before you buy the titanium version of anything.

Does the rainy season change the packing list?

The rainy season is a set of regional dates, and one coast has no dry season at all. Costa Rica's Instituto Meteorológico Nacional put the 2026 start between 27 April and 13 May depending on the region, and records the Caribbean slope with no defined dry season. ¹⁵ Puerto Viejo and Tortuguero get the rain shell in every month.

Bali runs on a different calendar. Indonesia's BMKG expects the 2026/2027 wet season to arrive later than normal across Sumatra, Java, Bali and Nusa Tenggara, with a later peak than its earlier forecast. ¹⁶ That shifts the odds and leaves the packing answer intact: quick-dry layers and a shell, plus a dry bag for anything with a battery.

Colombia asks for one extra layer. Its three climate regions run from the dry Caribbean coast, through the Andes where rainfall shifts most with elevation, to the consistently wet Amazon and Pacific lowlands. ¹⁷ A tropical list plus one warm layer covers Santa Marta and a Bogotá evening out of the same bag.

What sunscreen do the reef parks want?

Colombia's park agency asks for biodegradable sunscreen, and sells it inside the parks. Its ecotourism page recommends it to keep standard sunscreen chemicals out of the water, and lists it for sale at Tayrona, PNN Sierra de La Macarena, the Bogotá park store and the Cartagena dock. ¹³ Buying it on arrival saves cabin weight.

Quintana Roo works the same way in practice. Dive operators around Cozumel, Puerto Morelos and Cancún consistently report that the marine parks require biodegradable sunscreen free of oxybenzone and octinoxate, with CONANP rangers enforcing it at the boat. ¹⁴ Carry the mineral tube either way; the operators who run these trips report that rangers check at the boat.

Two of these four countries stop single-use plastic at the park entrance. Tayrona's entry rules bar disposable bags, styrofoam, bottles, cups, cutlery, straws and stirrers, along with pets, speakers and unpermitted drones. ⁶ Costa Rica's SINAC directive SINAC-DE-944-2020 has banned the same category inside national parks, biological reserves and national monuments since 25 February 2021. ⁷

Tayrona also closes for two weeks every autumn. Parques Nacionales lists the park shut from 19 October to 2 November for época de Nabbatashi, the annual cleansing period observed by the Indigenous authorities of the Sierra Nevada de Santa Marta, whose decision sets the dates. ⁶ Plan the Colombia leg around those dates, and pack the warm layer if the trip turns inland instead.

How do you keep the mosquitoes off?

The CDC prints the same five-part answer for Costa Rica, Mexico, Colombia and Indonesia, word for word. Cover skin with long sleeves, pants and a hat. Use 20% DEET or another repellent on the EPA's list. Treat clothing and gear with permethrin. Sleep in screened or air-conditioned rooms, and add a bed net for any night sleeping exposed to the outdoors. ⁸

Two of these legs carry a live notice. Northwest Costa Rica, which takes in Guanacaste, has a chikungunya outbreak notice dated 30 July 2026. ⁸ Travelers returning from Bali have brought Zika cases home, in a notice dated 7 August 2026. ⁹ Dengue sits behind both, a year-round risk with outbreaks every two to five years, dated 3 September 2026. ¹⁸

Malaria pills are a narrower question than the internet suggests. Two provinces in Costa Rica and three states in Mexico carry the CDC's chemoprophylaxis recommendation. ^{8, 19} Everywhere else on these four trips, bite prevention carries the load, which puts the repellent and the treated shirt ahead of any pharmacy line on the packing list.

What changes for Costa Rica, the Yucatán, Colombia and Bali?

One list, four adjustments, and the adjustment is usually the aircraft. A Costa Rica trip with a Tortuguero hop runs into Sansa's 4.5 kg. ³ A Bali trip on AirAsia runs into 7 kg, or 14 kg with the paid upgrade. ² Colombia's Wingo is the most generous at 12 kg from the Go Standard fare up. ¹²

Divers change the arithmetic entirely. A regulator, fins and a wetsuit outweigh two weeks of clothes, and any gear set heavier than 5.231 kg has to be checked on a standard AirAsia fare. ^{2, 1} MMT's guide to flying with your own dive gear weighs the baggage bill against renting at the shop, and the Amed shore-diving budget prices the other side of that decision.

Two weeks of clothes is the line most lists get wrong. Four days of clothes plus a laundry plan weighs less and dries faster in humidity. A monthly stay with a washing machine changes the list more than any packing cube, and MMT prices that choice against a run of short bookings.

Pack it in this order

The order matters, because the last two steps are the ones that cut weight. Everything here comes from a page you can open yourself, dated 25 September 2026. ^{1, 3, 2}

1. 01

   Weigh the empty bag

   Aer prints 3.90 lb for the Travel Pack 4 35L, which is 1.769 kg. ¹ Put it on the scale anyway, with the hip belt and any pouches you plan to keep on it.

2. 02

   Find the tightest leg

   One 7 kg AirAsia fare or one Sansa hop sets the number for the entire trip: 5.231 kg or 2.731 kg of contents. ^{2, 3, 1} Write that figure down and pack to it.

3. 03

   Treat the clothes before they go in

   CDC asks for permethrin on clothing and gear, never on skin, alongside 20% or stronger DEET for exposed arms and legs. ⁸

4. 04

   Add the bottle and the container

   Tayrona stops disposable bottles, bags, cups, straws and cutlery at the park entrance, and Costa Rica's parks have barred them since 25 February 2021. ^{6, 7} A refillable bottle earns its weight on day one.

5. 05

   Pick the sunscreen the park sells

   Colombia's agency recommends biodegradable sunscreen and stocks it at the Tayrona, La Macarena and Cartagena outlets. ¹³ Quintana Roo's reef operators ask for the same thing. ¹⁴

6. 06

   Check the health notice the week you leave

   The chikungunya notice for northwest Costa Rica is dated 30 July 2026, and the Bali Zika notice 7 August 2026. ^{8, 9} Both pages change on the agency's schedule, so read them again close to departure.

7. 07

   Weigh the packed bag, then take a kilogram out

   The kilogram comes off the clothing pile, because the bottle, the repellent and the shell all have a rule or a forecast behind them. ^{6, 8, 15}

Then weigh it once more with the bottle full. That is the bag that has to clear 4.5 kg at the Sansa counter in San José, and 7 kg at the AirAsia counter in Denpasar. ^{3, 2}