The WATERFLY Small Lightweight Packable Backpack is the kind of bag that makes sense when you need a little extra carrying space without committing to another full-size backpack. It packs down small enough to toss into luggage, then opens into a 20L day pack with room for beach gear, hiking essentials, snacks, bottles, and a few tech accessories.
I went into this expecting a basic lightweight bag. What surprised me was how much it actually held. It is not built to replace a padded everyday backpack, and I would not use it for heavy loads or unprotected electronics. But for a beach day, a pool trip, a short hike, or as a backup bag while traveling, the WATERFLY Small Lightweight Packable Backpack does a lot more than its tiny packed size suggests.
A 20L Backpack That Packs Into Its Own Pouch
The first thing that stands out is just how compact this bag becomes. Folded into its integrated pouch, it measures roughly 9 inches by 6 inches by 3 inches, and it can be squeezed down a little further depending on how tightly it is packed.
That matters because this is not a separate storage pouch you have to remember to carry. The pouch is built into the backpack itself. When the bag is opened, that same piece becomes an additional zippered compartment. When it is time to pack up, you simply turn it back into the storage pouch and zip it closed.
It is quick enough to do without turning it into a whole project. Fold the backpack inward, work it into the pouch, close the zipper, and you are back to a compact little package with a carry handle.
Material Feel and Water Resistance
Right out of the pouch, the WATERFLY Small Lightweight Packable Backpack feels more durable than a flimsy disposable-style bag. The fabric has that coated texture that suggests water will bead and run off rather than soak in immediately.
In practical use, it handled a little water on the outside without issue. That is useful for the beach, the lake, poolside, or an unexpected light rain. I would call it water-resistant, not waterproof. If water gets poured into the bag or it sits submerged, your belongings are still going to get wet.
The water-resistant material makes more sense for the intended use: carrying towels, clothing, snacks, bottles, sandals, and lightweight gear outdoors without worrying about every splash or wet surface.
Storage and Compartments
For such a light bag, the storage layout is pretty solid. The WATERFLY Small Lightweight Packable Backpack has more than one big open compartment, which is important because a single empty cavity gets messy fast.
Front Storage
On the front, there is a small zippered pouch that works for compact items such as keys, coins, a tracker, or other small essentials. The zipper pulls feel decent, and there are adjustment pulls that can cinch the bag down when you are carrying less.
There is also a detachable small pouch on the front. Once removed, it can hold your keys or a tracker and go with you separately. You could clip it to clothing, keep it in a pocket, or carry it while leaving the backpack behind.
One thing to remember when reconnecting that pouch is to get the zipper end fully seated. It works much like zipping a jacket. If it is not pushed all the way into place, it can come apart. Once connected properly, it zips back on without trouble.
Deeper Front Pocket and Main Compartment
Behind the smaller front area is another deeper zippered pocket. It gives you a separate place for flat items or things you want away from the main load.
The main compartment is where the 20L capacity really comes into play. It is roomy enough for clothes, a towel, snacks, sandals, and tech gear that is already in a protective case. There is also an internal sleeve that could hold a tablet or laptop-sized item.
However, I would not place a laptop directly in there. The sleeve is useful for organization, but it is not padded. The same goes for the shoulder straps. This is not a laptop commuter bag or a gear-hauling backpack. If you bring a camera, tablet, or other electronics, use a protective case first.
Two Bottle Pockets and Compression Straps
There are mesh bottle holders on both sides, which is a big plus for hikes and beach days. Having two side pockets means you can carry two water bottles, or use one for a bottle and the other for something else you want easy access to.
The side compression straps are also useful. They can pull the load together so smaller items do not bounce around inside. The straps move and adjust rather than sitting there purely for looks, which helps when you are carrying a partly filled bag.
Comfort: Know What This Backpack Is For
The WATERFLY Small Lightweight Packable Backpack has mesh-style shoulder straps, but there is no meaningful padding in them or in the back panel. That is the major limitation, and honestly, it is exactly what I expected from a packable backpack this light.
This bag is best for:
A short beach or pool trip
A light hike with water, snacks, and a towel
A day out when a larger travel bag stays behind
A backup backpack packed inside a suitcase
Carrying lightweight clothing and essentials
It is not the right pick for daily commuting with a heavy laptop, long walks with a loaded bag, or packing a lot of dense gear. Once you add significant weight, the lack of padding will show itself.
Think of it as a practical day carry bag, not a full-support backpack. Keep the load reasonable, and it makes sense.
Real-World Packing Test: What Actually Fits?
A bag can have a nice design and plenty of pockets, but none of that matters if it cannot carry the things you actually take with you. So I loaded up the WATERFLY Small Lightweight Packable Backpack for a beach day.
The gear included:
Swim trunks
A full-size towel
Beach sandals
A Bluetooth speaker
An Insta360 camera in a protective pouch
A tech pouch with charging gear and a tracker
At first, I thought the full-size towel was going to be the deal-breaker. The material does not stretch much, so this is not one of those bags that suddenly doubles in size when you force more stuff into it. But after packing the camera pouch at the bottom, adding the charger pouch, trunks, speaker, towel, and sandals, everything fit.
That was the point where this little bag really surprised me. It was close to its maximum capacity, but it held the essentials for a day at the beach and was still easy to carry.
A coffee cup also fits in a side bottle pocket, and a second bottle could fit on the other side. For hiking or a day outdoors, two water bottles are a very practical feature.
How I Would Pack It
You can get more out of this bag by loading it thoughtfully rather than simply shoving items inside.
Place protected electronics at the bottom. A camera in a padded case is a better choice than loose electronics.
Add dense items next. Put chargers, battery gear, or other compact accessories close to the bottom and back.
Use soft clothing to fill gaps. Swim trunks, a light layer, or a towel can help stabilize the load.
Use the upper pocket for quick-access items. The speaker fit well in the upper section.
Save the side pockets for bottles. This keeps hydration accessible without opening the main compartment.
Cinch the straps if needed. Tightening the bag helps keep the load from shifting.
For a towel-heavy trip, roll the towel tightly before loading it. The bag can fit a full-size towel, but this is where neat packing makes a difference.
Who Should Buy the WATERFLY Small Lightweight Packable Backpack?
The WATERFLY Small Lightweight Packable Backpack makes the most sense for someone who wants a compact, affordable, lightweight bag ready when a regular backpack is too much.
It is a good fit if you want:
A packable travel day pack
A beach, lake, pool, or park bag
A light hiking backpack for water and snacks
An extra bag for souvenirs or overflow items while traveling
A way to carry essentials without hauling your main luggage
It is less ideal if your priority is all-day comfort under a heavy load, laptop protection, or padded support for expensive equipment.
Final Thoughts
The WATERFLY Small Lightweight Packable Backpack does what it is supposed to do, and then it goes a little beyond that. It packs down incredibly small, feels water-resistant, gives you several compartments, includes two bottle pockets, and holds a surprising amount of real-world day-trip gear.
The lack of padding is the tradeoff. Keep that in mind and do not expect it to replace a dedicated work, school, or heavy hiking backpack. But as a lightweight carry bag for summer, travel, the beach, or a quick outing, this one earned a thumbs up from me.
For the price and the convenience, the WATERFLY Small Lightweight Packable Backpack is a smart piece of gear to keep packed and ready for the next day out.
Click on this link for the full video review: https://youtu.be/-OgkaOcscws