WATERFLY 20L Hiking Backpack Review: A Lightweight Daypack That Punches Above Its Price

Heading out for a day hike tends to create the same dilemma. A full backpacking pack is far too much bag for six hours on the trail, but going without one leaves you with a water bottle jammed under your arm and snacks stuffed in your jacket pockets.

The WATERFLY 20L Hiking Backpack aims squarely at that middle ground. It is a lightweight daypack that is big enough for a day’s gear yet small enough to stay out of your way, pairing a 20L main compartment with a padded sleeve for a laptop or a hydration bladder, a ventilated back panel, and a water-resistant nylon-and-polyester shell.

I put this hiking backpack through real trail use, along with a few travel and commute days, to see how it holds up. The short version? For an affordable, lightweight pack, it does the job better than its price suggests, with only a couple of caveats worth knowing before you buy.

What I Liked

The WATERFLY 20L hiking backpack won me over in a few specific areas during testing. Here is what stood out.

Genuinely Lightweight Without Feeling Flimsy

The first thing you notice picking this backpack up is how little it weighs. Empty, it comes in at just 1.37 pounds, roughly the weight of a full 20-ounce water bottle, and loaded with a normal day’s gear it practically disappears on your back.

What surprised me is that the light weight does not come from thin, cheap fabric. The 600D polyester and 200D nylon shell has real body to it, closer to a mid-tier pack than the flimsy budget daypacks I have handled before. If you want that trail-ready feel with a structured harness that transfers heavier loads to your hips, the Osprey Talon 22 is the step up for day hikers carrying more gear.

Smooth SBS Zippers With Grippy Pull Rings

Every zipper on this bag uses a smooth two-way SBS slider topped with a thick rubbery pull ring. Those rings are a small touch that pays off on the trail, letting you grab and open a pocket quickly, even with gloves on.

The zippers glide cleanly rather than catching, which matters when you just want fast access to a snack or a layer without stopping to wrestle with the bag.

Thoughtful Pocket and Compartment Layout

For a 20L daypack, the organization is better planned than most packs at this price. You get a roomy main compartment, a deep back pocket that runs the full height of the bag, two small interior mesh pockets for keys, a front zip pocket, and side mesh pouches for water bottles on both sides.

An exterior bungee cord and small hooks let you lash a jacket or wet gear to the outside. Those little interior pockets also turned out to be perfect for cables and a power bank on commute days. When your trip outgrows a daypack and you need multi-day capacity with the same thoughtful storage, the Granite Gear Blaze 60L Backpack scales that organization up for loads between 30 and 50 pounds.

Comfortable Ventilated Back Panel and a Safety Whistle

A PP board built into the back keeps the pack’s shape so nothing inside pokes your spine, while a ventilated 3D mesh panel sits over it to move air behind your back. On a hot climb, that mesh is the difference between finishing with a dry back and a soaked one.

The real surprise is tucked into the chest strap: a small safety whistle that sits right at your collarbone. Out in the backcountry you can only yell for so long, but you can whistle far longer, and it is reachable without taking the pack off.

Doubles as a Travel and Commuter Bag

The padded main sleeve holds a laptop or tablet up to 15.6 inches, which is why this works as more than a trail bag. It also fits a 2L hydration bladder, with a hose port up top that feeds the tube out to your shoulder strap for hands-free drinking.

At 10.8 by 6.5 by 18.9 inches it meets airline carry-on requirements, so it flies with you and becomes your daypack once you land. One Reddit camper summed up the everyday carry appeal, saying they use a WATERFLY 20L pack “for skiing and wilderness trips” and that it is “durable and fits all my gear.” When you need an even lighter hands-free option for daily errands, WATERFLY brings the same budget-friendly approach to the WATERFLY Crossbody Sling Bag for carrying just the essentials.

What Needs Improvement

No pack is perfect, and a few things keep the WATERFLY 20L hiking backpack from being a trail-to-town do-everything bag.

Shoulder Padding Is on the Modest Side

The shoulder straps are comfortable for typical day loads, but the padding is modest. Pack it heavy and you will start to feel the straps dig in on a long climb, which is the trade-off for keeping the bag this light.

For water, layers, snacks, and a first aid kit it carries comfortably through a five-to-seven-hour day. If you routinely haul heavier loads, the thin padding is the first thing you will notice.

The Sternum Strap Runs a Little Short

The sternum strap is the one piece I would change first. Worn over a few layers in cooler weather, it runs a touch short and can be awkward to clip, though it is fine over a single shirt.

Water-Resistant, Not Waterproof

The shell shrugs off light rain and brushing past branches, but it is water-resistant rather than waterproof. In a sustained downpour, water eventually finds the exposed zippers and seams, so if real rain is in the forecast, tuck a plastic bag or dry liner around your spare clothes. The upside is that the fabric dries out quickly once the weather clears.

The Waist Belt Is a Stabilizer, Not a Hauler

The waist belt is thin, so treat it as a swing stabilizer rather than a load-bearing hip belt like the one on a full backpacking pack. It does keep the bag from bouncing on the trail or swinging into people on a crowded train, but it will not transfer weight off your shoulders. This is a budget daypack, and as one Reddit user bluntly put it, with WATERFLY “you really do receive the quality that corresponds to the price” — fair for the money, but not Osprey-grade.

How It Compares

At its budget price, the WATERFLY 20L hiking backpack competes with both name-brand daypacks and WATERFLY’s own lineup. Here is where it lands.

vs Osprey Daylite Plus

The Osprey Daylite Plus is the premium 20L comparison, with a more sophisticated AirScape ventilated back panel, an adjustable sternum strap with its own whistle, a removable hip belt, and Osprey’s lifetime guarantee. It is the clear step up in outright build quality.

The catch is price: the Daylite Plus costs roughly two to three times as much, and its padded sleeve only fits a 14-inch laptop. The WATERFLY takes a larger 15.6-inch laptop and includes a waist belt of its own, so if you want most of that functionality for a fraction of the money, it makes a strong case.

vs WATERFLY Small Lightweight Packable Backpack

Confusingly, WATERFLY also sells a Small Lightweight Packable Backpack — a foldable, 10.2-ounce recycled-nylon model that collapses into its own pouch. That lightweight packable backpack is the better pick purely as a stowable backup you can leave at the bottom of a suitcase.

But the foldable design drops the structured PP-board back panel, the padded 15.6-inch laptop sleeve, and the waist belt that make this standard hiking backpack work as a commuter and travel bag. If you want a daypack you reach for every day rather than a just-in-case spare, the structured 20L version reviewed here is the one to get.

vs Venture Pal

Venture Pal’s packable daypacks are the other budget favorite, winning on folded size and rock-bottom price. Like most packables, though, they skip the rigid back panel, laptop protection, and hip belt, so the WATERFLY is the more comfortable everyday carry for hiking, travel, and commuting alike.

Final Verdict

The WATERFLY 20L Hiking Backpack is a lightweight daypack that is better organized and more comfortable than its budget price suggests, as long as you match it to day-sized loads.

I am giving it a 4.3 out of 5.

It loses a little for its modest shoulder padding, a short sternum strap, and a stabilizer-only waist belt, but the low weight, smart pocket layout, ventilated back panel, and laptop-ready sleeve more than earn it back.

Bottom line: If you want an affordable, lightweight hiking backpack for day trips, travel, and commuting — and you do not need a true load-hauling pack — the WATERFLY 20L is an easy daypack to recommend.