I bought this for a kayak-swim trip. It is rugged and awesome on a kayak and totally waterproof. I also checked it as luggage when I overpacked my suitcase and it was an outstanding alternative! It has great caribiner loops and really well stitched, strong backpack style straps and top and side handles. A total winner.

The 20L was larger than expected and holds everything I needed without being cramped. Great bag for the price.

Overall, this is a great product. I work as a commercial seaplane pilot in the Bahamas, and wanted to upgrade my pilot bag to something waterproof, high visibility, and easy to carry/use.
I ended up buying two of these bags: One was the 10L Hi-Vis Orange bag, and the other was the 20L Hi-Vis Yellow bag. I'll review both, starting with the 10L.

10L Bag:
One thing you have to keep in mind with these bags is that they require 3-4 folds before you buckle the top closed to be effectively waterproof. What this means is that the bags are not as tall as you would think just looking at them in the package. I haven't actually attempted to measure the size of the bag when it is closed to see if it is actually 10L, but I would assume the overall space is reduced when closed (especially depending on how many folds you put in before closing it). With this being said, I can easily recommend the 10L for 3-4 medium sized handheld items (which I will specify now).
For myself, I stored an aviation headset bag (measures about 6x4x10 [LxWxH]), a pilot logbook (6x2x12), my passport booklet, sunscreen, and an ipad mini. It was snug, but I could still get 3 rolls and latch the bag shut without any problems. Initially this was okay, but I wanted a little more room so that I could bring extra items like extra clothes, bandages, water, etc. as my days are long and spent in the sun.
Now, I carry the 10L bag with me (Folded up nicely in my 20L bag) as an extra buoy if I have to cut an anchor line. These bags are air tight when closed properly and will hold any residual air inside once closed. All I have to do now is blow a little air in the bag, roll it, latch it, and it is a buoy or flotation device.
The 10L bag is great if you don't have TOO much stuff to carry, but I'd caution you to go with the larger option if you are unsure and aren't confined to a small space for the bag.

20L Bag:
The 20L bag functions the same way as the 10L, but supplies twice the space. I have plenty of room for all of the items mentioned above, and some. An added benefit is that the 20L comes with 2 straps instead of one, so I can wear it as a backpack when walking around the islands. Beyond that, there really isn't much difference at all between the bags.

Pros:
-The bags are simple to use and versatile
-The color options are great, especially if your use for the bag may end up with the bag falling overboard
-The bags will float when sealed properly
-No water has been found in my bags yet (but I'd still add extra caution and seal anything you absolutely can't get wet in another plastic bag as well)

Cons:
-Folding the bag over eliminates some space, which means you need to plan your space utilization carefully if you want a waterproof bag!
-The bag is not designed to be submerged for more than a few seconds... it is waterproof when floating (which is what it does). If you force it underwater for too long, the pressure of the water may force some liquid into the bag

Overall, I'd say this is a great, CHEAP, and simple product. Take it from someone who's out on the ocean all day: it works!

bought nov 22 2022
as noted below, i sadly had to cut the shoulder straps off as this was always bought w intention of usage inside my 36l outdoor products hiking backpack
well, this dry bag still works welll as the durable inner gab for my hiking backpack
still keeps contents dry when needed
helps reduce wear/tear on my hiking backpacks rather thin bottom
will buy as a beach bag when i need a beach bag as im surrounded by 'em
g8 bag g8 value
oh and it is now juen 13th 2023 as of this review update, daily usage in my backpack
note i have not clipped it shut daily - that only done a couple of times so cannot speak to buckle durability but they seem like your standard heavy duty plastic buckles so i dont see why they would ever fail

no reason to buy sea to summit brand or similar as this bag is as good albeit far heavier but mabye this brand sells a lighter version/thinner version. agian this bag is made to be a stnadalone dry bag in a kayak etc i think. so much thicker than my 5L sea to summit bag (which has withstood 8 years of use as my 13 inch laoptop bag)

Sadly the straps are not removable
seriously i am sad about this as they are so thick and well made i was sad to cut them off lol
why?
cuz they are so heavy, so padded, that they added seemingly a half or 2/3 lb to my backpack
this dry bag is perfect for my 36L hiking backpack with just 1 pocket.
i put this 40L dry bag in and it def will add durability esp to bottom of my backpack as i carry electronics laptops etc in it
i didnt want to cut the straps cuz of how nice n sturdy they seemed but had to

the folding top and closure buckles seem heavy duty
the bag is thick dunno thickness but a couple to seve mm??
my sea to summit 5L drybag is prob a 1/3 thick but then again thatbag is meant for inside a backpack or other bag and not as a standalone bag i thik.

this orang 40l could easily last by itself - a reviewer in Hi said they've used it for a long time which is why i bought it - they said it lasted beaches salt air etc so i know it can last inside a backpack lol

anit is same thickness if not more as my 20L dry bags from Outdoor products - a value brand you can get at walmart whose products all have LIFETIME warranty!!! OP products is also my backpack brand. i have 3 of their bakcpacks. they will always replace your item even years later. i knos cuuze ive done this on 2 items. one was for a frayed chsest strap & other leaking water puch. - point is this 40L orange bag seems as good as OP...

will update over time and nope aint gonna fix typos lol

During a recent rafting adventure, I had the opportunity to put the MARCHWAY Floating Waterproof Dry Bag 40L to the test. Designed to keep your gear dry in various water-based activities such as kayaking, rafting, boating, swimming, camping, hiking, beach trips, and fishing, this dry bag proved to be an invaluable companion. Its outstanding waterproof performance and reliable construction provided the ultimate protection for my belongings as we navigated through challenging rapids and unpredictable water conditions.

Waterproof Performance:
The MARCHWAY Floating Waterproof Dry Bag 40L exceeded my expectations in terms of waterproofing. The roll-top closure system, combined with the secure buckle, formed an impenetrable barrier against water. Even during intense rapids and when completely submerged, the bag flawlessly kept the contents dry. This level of protection gave me peace of mind, knowing that my valuables, extra clothing, and electronics were safe from water damage throughout the entire rafting journey.

Durability and Reliability:
Constructed with rugged materials, the MARCHWAY Dry Bag is built to endure the most demanding outdoor adventures. The 500D PVC material used in its construction provides exceptional durability, effectively guarding against punctures and tears. The seams are expertly welded and reinforced, enhancing the bag's overall strength and preventing water from seeping through. This level of durability ensured that my gear remained protected even when subjected to rough handling and contact with rocky surfaces.

Spacious and Practical Design:
With its generous 40L capacity, the MARCHWAY Dry Bag offered ample space to store all my essentials for the day-long rafting trip. The roll-top design allowed for easy adjustment of the bag's capacity, ensuring a secure and snug fit regardless of the load. The single shoulder strap, which can be adjusted and removed, provided comfortable and convenient carrying options, whether slung across the shoulder or attached to the raft. The bag's versatility in terms of portability made it extremely convenient during the rafting adventure.

Additional Features:
In addition to its exceptional waterproof capabilities, the MARCHWAY Dry Bag offered several noteworthy features. The bag's ability to float on water proved invaluable, as it allowed for quick retrieval in case it accidentally fell overboard. The bag's resistance to dust, sand, and dirt protected my gear from the elements, ensuring that everything inside stayed clean and intact. Moreover, the bag's resistance to UV rays prevented color fading and degradation even during prolonged exposure to the sun.

Easy Accessibility and Organization:
The roll-top closure system of the MARCHWAY Dry Bag provided effortless access to my belongings whenever needed. Opening and closing the bag was a breeze, and the watertight seal was maintained without any difficulty. The spacious interior of the bag allowed for easy organization of my gear, and the transparent panel on the front provided visibility and quick identification of items, saving me time and effort during the rafting adventure.

Conclusion:
In conclusion, the MARCHWAY Floating Waterproof Dry Bag 40L is an exceptional choice for those seeking unparalleled waterproof protection during water-based activities such as rafting, kayaking, and boating. Its outstanding waterproof performance, durability, practical design, and additional features make it a reliable companion on any adventure. Having experienced its unwavering waterproofing capabilities firsthand, I can confidently recommend the MARCHWAY Dry Bag to anyone looking to keep their gear dry and secure while enjoying thrilling outdoor activities.