An honest research review of the dry bag we'd tell a friend to buy before flying — picked by comparing specs and thousands of owner reviews, not by dunk-testing it ourselves.
Last updated: October 19, 2026
Cambodia is a wet trip even when it isn't raining. The ferry to Koh Rong throws spray over the deck for two hours. Longtail boats on the Tonlé Sap sit low in the water. Wet-season downpours arrive in minutes, and tuk-tuk rides come with road spray. That's why a dry bag sits on our buy before you fly list: it's the one cheap item that protects everything else you packed — phone, camera, passport, dry clothes — all at once.
So which one? We compared Amazon's best-selling dry bags on what separates a good one from a leaky one — seams, fabric, closure, straps — and read what owners praise and complain about after real use. Here's the pick, the honest downsides, and the runner-up.
⭐ 4.8 out of 5 · 12,658 ratings on Amazon
$14.99 on Amazon when checked October 19, 2026 (starting size; the 20L we recommend below runs a few dollars more, still under $25) — prices change; the button shows today's.
Roll-top dry bag in 5L, 10L, 20L, 30L and 40L, from the MARCHWAY store on Amazon.
Check price on AmazonOur pick: the MARCHWAY Floating Waterproof Dry Bag — because it's built the right way (welded seams, tough tarpaulin, a roll-top sealed with trapped air so it floats), it comes in every size a Cambodia trip needs, and it costs less than a single ruined phone screen. It's the one we'd buy.
It floats — and on Cambodian water, that matters. Seal the MARCHWAY with air inside (spread the round base, roll the top down three to five times, buckle) and it bobs on the surface instead of sinking. On a Koh Rong supply boat or a Tonlé Sap floating-village tour, a bag overboard with your cash and camera inside is only a disaster if it disappears. Owners consistently call out the floating as the feature they ended up grateful for.
The seams are welded, not stitched. This is the real dividing line in dry bags. Stitched seams are rows of tiny holes, and they're exactly where thin dry bags tend to let water in. MARCHWAY's seams are welded shut, and reviewers keep coming back to the same point: contents stay dry through rain, spray and quick dunks, season after season.
The fabric can take tuk-tuk life. The ripstop tarpaulin has a flexible PVC mesh core, so it shrugs off scrapes from boat hulls, rocky beaches and dusty footwells, and wipes clean. Cambodia is hard on gear in small, unglamorous ways — this bag is designed to be thrown around, not babied.
It's cheap enough to be an easy yes. The whole range sits under about $25, every size folds flat into its own storage pouch for the flight over, and the 20L and 30L add backpack straps for the walk from pier to guesthouse. No reason to gamble on an unbranded bag in-country.
From the spec sheet and patterns in owner reviews.
| Detail | MARCHWAY Floating Waterproof Dry Bag |
|---|---|
| Sizes | 5L · 10L · 20L · 30L · 40L |
| Material | Ripstop tarpaulin — flexible PVC mesh-core, multi-layer |
| Seams | Welded |
| Closure | Roll-top with buckle (roll 3–5 times) |
| Straps | Adjustable removable shoulder strap (5L/10L); backpack straps (20L–40L) |
| Extras | Reinforced D-ring; storage pouch the bag folds into |
| Floats | Yes — when sealed with air trapped inside |
| Submersion | Not designed for extended submersion |
| Amazon rating | 4.8 out of 5 from 12,658 ratings (October 2026) |
If you'll carry your dry bag for hours at a time, the Earth Pak Waterproof Backpack is the step-up pick: a padded, backpack-style dry bag with internal pockets and an included waterproof phone case, backed by a five-year warranty. The catch is price — around $59.99 on Amazon when checked October 19, 2026, roughly three times the MARCHWAY. Better carry comfort and a warranty; the same basic job done.
For most Cambodia trips, buy the 20L. It swallows a towel, dry clothes, a camera, sunscreen and snacks — the full Koh Rong day kit — and it's the smallest size with backpack straps. The 10L is the valuables-only option for beach days. The 30L and 40L suit couples sharing one bag or multi-day river trips, and are overkill for most travelers.
One sizing truth for every roll-top: headline capacity is measured unrolled. Rolled down properly, expect noticeably less usable space — if you're between sizes, size up.
Skip this bag if you're an ultralight packer counting grams (PVC tarpaulin is tougher but heavier than thin nylon dry sacks), if you need genuine submersion protection for diving or swimming with your gear, or if you want pockets and organization — this is deliberately one big waterproof tube, and that's the point.
Yes — that's its home turf. Ferry spray, rain and waves over the side are what a welded roll-top is built for, and sealed properly it floats if it goes overboard. Just roll the top three to five times — a lazy single roll is how dry bags get beaten.
For spray, rain and a brief dunk, yes — that's the standard owners rely on daily. For an expensive camera, add a small padded case inside for bump protection, and remember no roll-top from any brand is rated to sit submerged. Keep the passport in the middle, wrapped in clothes.
It can, especially the 20L with backpack straps — plenty of travelers do exactly that around the islands. Just know there's no padding or organization, so for long temple days most people prefer a normal daypack and keep the dry bag for water days. Our Plan Your Trip hub covers the rest of the gear-and-paperwork picture.
The button below shows today's price and sizes on Amazon:
Still building the packing list? The dry bag is one item of many — the full rundown is in buy before you fly, or head back to the homepage for the 30-second before-you-go checklist.
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