Carry-on scuba gear: what fits, and what to rent

What one bag with dive gear actually means

Three legs, three different boxes. A week in Cozumel off a dive boat, ten days of shore diving at Amed in east Bali, then six nights on a Komodo boat out of Labuan Bajo. One bag for all of it. Dive gear is the easy thing to want and the hard thing to carry, because the last flight of the trip has the tightest cabin rule on the whole ticket. ^{1, 8}

Most travelers picture the industry reference figure: 56 x 45 x 25 cm, about 63 liters of box. Wings Air, which flies the ATR turboprops into Labuan Bajo, allows 35 x 30 x 20 cm at 7 kg, about 21 liters. Everything below answers to that number. ^{3, 1, 14}

So the order here follows the trip. The cabin box first, then the gear that clears it, then what each shop charges to rent the rest. Every price on this page comes from the operator's own page, read on 25 September 2026 and the Scubapro figures on 28 September. ^{7, 5, 6}

How small is the smallest cabin box on your route?

Six published cabin-bag rules on the routes into Cozumel, Bali and Labuan Bajo, read on 25 September 2026.

Volume is the honest way to compare cabin rules, and airlines publish it as three numbers. Multiply them out and the spread is wide: 63 liters at the industry reference, 24 liters on Lion Group's jets, 21 liters on the Wings Air turboprops that serve Labuan Bajo. Same 7 kg of weight, a third of the space. ^{3, 2, 1}

One line in the Lion Group help center decides the whole itinerary. A trip that connects onto a Wings Air ATR follows the 35 x 30 x 20 cm box for the entire ticket, whatever airline issued it. Book the jet and the turboprop together and the small rule wins. ¹

Weight bites before volume. The Aer Travel Pack 4, the 35 L pack MMT rates first among one-bag backpacks on published fit and weight, is 1.77 kg empty, which leaves 5.23 kg of a 7 kg allowance for everything inside it. ^{4, 1}

The discontinued Hydros Pro BCD weighs 5.28 kg on its own, 0.05 kg past that remainder, and even the 2.54 kg travel BCD Scubapro sells today eats half of what is left. A jacket BCD is out of the cabin on this leg; a travel BCD costs you the clothes. ^{12, 13}

What dive gear to bring, and what to leave

Carry the things that fit your face, your feet and your wrist. Rent the things that fit anyone. That one rule sorts a dive kit faster than any packing list, because the gear that has to match your body is light and the gear that only has to work is heavy. ^{11, 12}

• Mask. The one item worth its space every time. Renting costs $3 a day at Amed and, bundled with a snorkel, 140 pesos a day from the itemized shop on Cozumel, about $8.12 at 17.2454 pesos to the dollar. A rented skirt that leaks costs you the dive. ^{5, 9, 10}
• Dive computer. 122 g, 77 x 68 x 25 mm and $580 for a Shearwater Peregrine. Two Komodo boats print the same sentence: dive insurance is mandatory, as is your own personal dive computer. ^{11, 6, 8}
• Fins. Long, stiff and rentable on every leg here: $3 a day at Amed, 140 pesos on Cozumel, or folded into the full set everywhere else. Leave them home unless you dive on them weekly. ^{5, 9, 7}
• Wetsuit. A shorty rents for 250 pesos on Cozumel, about $14.50, and a confirmed 3 mm shorty for $10 on the Aurora. Amed's list prints $6 a day and names no style or thickness, so ask. It is the bulkiest thing a one-bag traveler can hand to somebody else. ^{5, 6, 9, 10}
• BCD and regulator. $6 each a day at Amed, $10 each on the Aurora, 250 pesos each on Cozumel. Together they are most of the weight and most of the volume of a dive kit. ^{5, 6, 9}

The electronics are a rounding error. A 122 g computer is more than 40 times lighter than a 5.28 kg BCD. Put the whole buy-or-rent question on the BCD and the wetsuit, and the small items stop mattering. ^{11, 12}

A year of diving hides this arithmetic inside single trips. MMT's year of diving budget and the break-even worksheet for buying gear run the same sums across a season instead of a week.

What does renting cost in Cozumel and Amed?

Five named dive shops on two islands, priced from their own pages on 25 September 2026.

Cozumel sells two philosophies on one island. One shop charges a single flat rate per diver per day and hands over everything. The other prices every piece in pesos, so you rent a regulator and keep your own mask. A reader who wants one number needs the first; a reader packing light needs the second. ^{7, 9}

Amed is the cheap leg, and it is itemized down to the boots. A full set is $16 a day, a computer $8, a mask $3. A second shop in the same village prints its rentals in rupiah. A third folds the gear into the dive price and charges nothing separate for it. ^{5, 18, 19}

Ten diving days at Amed with a full set and a computer comes to $240. A flat-rate week on Cozumel is $210 for the set alone. Those two numbers change how a shore-diving base at Amed reads next to the Cozumel diving budget, which adds the boats and the marine park fees on top. ^{5, 7}

What do the Komodo liveaboards charge?

Two boats out of Labuan Bajo print the same requirement, word for word: dive insurance is mandatory, as is your own personal dive computer. Both then rent a computer for $10 a day. Read it as a strong preference with a fallback, and ask the boat which it means before you pay the balance. ^{6, 8}

Gear rental sits outside the trip price on both boats. Six nights of a full set plus a computer is $180 on one and $240 on the other, on top of the cabin fare. That is the line most liveaboard quotes leave for later. ^{6, 8}

A boat week and a shore week price differently once gear is inside the total. MMT sets them side by side in liveaboard against shore diving, and the Indonesia travel guide covers the flights that get you to the dock. Both boats require dive insurance, which MMT prices in what a dive policy costs. ^{6, 8}

Should you buy your own computer or rent one?

At $10 a day, a $580 computer pays for itself on the 58th dive day. At Amed's $8 it takes 73 days. At the Cozumel itemized rate of 320 pesos, about $18.56, it takes 32. Count your real dive days over three years and the answer stops being a feeling. ^{11, 6, 5, 9, 10}

A BCD is the opposite call. The travel BCD Scubapro sells today is $739, which is 74 dive days at the Komodo rate and 124 at Amed's $6. It weighs 2.54 kg, nearly half the 5.23 kg the empty pack leaves you, so 2.69 kg is left for clothes, a regulator and everything else. Rent the BCD, every trip. ^{13, 6, 5, 4, 1}

The mask is the cheap exception. $3 a day at Amed sounds like nothing until a rental skirt leaks on the third dive of a $210 week. Buy the mask, keep it in the cabin, and rent everything with a hose on it. ^{5, 7}

Mask, fins, computer: packing the carry-on

The bag gets packed twice: once for the long-haul flight, once for the turboprop. The second pack is the one that catches people out, and it happens in a hotel room in Bali the night before the flight to Labuan Bajo. Do it at home first, with scales. ¹

1. 01

   Weigh the packed bag before the taxi

   Wings Air's cabin box is 35 x 30 x 20 cm at 7 kg, and the Aer Travel Pack 4 uses 1.77 kg of that empty. What is left for gear, clothes and electronics is 5.23 kg. ^{1, 4}

2. 02

   Split the kit into a cabin pile and a hold pile

   A dive knife and a spear gun travel in checked bags only, per TSA's own rules, and anything sharp in a checked bag should be sheathed or securely wrapped. The officer at the checkpoint makes the final call on any item. ^{20, 21}

3. 03

   Check the aircraft type on the last leg

   An itinerary that connects onto a Wings Air ATR follows the smaller 35 x 30 x 20 cm cabin box for the whole ticket, whatever airline issued it. ¹

4. 04

   Budget for the hold on the propeller leg

   Lion Group routes served only by propeller aircraft carry zero free checked allowance, against 15 to 20 kg in economy on the jets. The pack goes below on that sector, and it goes below as a paid item. ²

5. 05

   Read your carrier's scuba policy for the long leg

   Southwest takes scuba equipment as checked baggage in place of one free piece at no extra charge and waives the oversize fee, with a ceiling of 100 lb and 115 total inches; standard and overweight fees still apply, and air tanks travel empty. ²²

Three legs, one bag

Here is the route the numbers on this page came from, laid out as a plan to copy. Swap the destinations and the shape holds: one leg where the shop rents everything, one leg where you rent by the piece, one leg where the boat expects you to arrive equipped. ^{7, 5, 6}

Twenty-three nights in one bag changes where you sleep, too. Monthly rates beat nightly ones sooner than most travelers expect, and MMT's monthly stays against short bookings has the crossover point. The marine park fees page covers the line most dive budgets miss entirely.