This review of the Atom Packs Nanu X25 (21 oz / 600 g, MSRP: $269) examines a multi-use daypack with the potential to function as a one-night overnighter. The Nanu X25 is constructed with X10 Cotton Duck Fabric, 500 denier nylon, Dyneema Composite Fabric-reinforced stretch material, and triple stitched and bound seams.
Ryan Jordan talks about minimalist backpacking concepts and Atom Packs Nanu X25 features and specifications in the following video:
The X25 won’t replace anybody’s multi-night pack, and I don’t see it excelling in fastpacking applications (the relatively heavy material choice and shoulder-strap designs preclude it from that). But with a blend of bike, commuting, and backpacking specific features, it could replace two or three packs on the low-volume end of a backpack quiver.
- clean, minimal aesthetics
- body fabric: X10 Cotton Duck
- back panel and shoulder strap fabric: 500d nylon
- pocket fabric – Dyneema Composite Fabric stretch
- classic overnight pack design – roll-top closure, three pockets
- shoulder-strap pocket
- padded laptop sleeve
- removable sternum strap
- triple stitched and bound seams
- zip upper pocket with internal key clip
- shock cord compression tensioners
- shock cord trekking pole attachments
- bike light loop
I tested the Atom Packs Nanu X25 on a couple of day hikes in the Tahoe Basin Land Management Unit (the traditional land of the Wašišiw people). Leaning into the Nanu X25’s intended use, I also ran some bike errands with it – to the grocery store, to the coffee shop to do some work, and to the post office. I didn’t push the Nanu X25 to its limits as a one-night overnight pack, but Backpacking Light founder/owner Ryan Jordan did, and I tap into his experience in this review as well.
Fabric and Aesthetics
Atom Packs deviated from typical ultralight fabrics with the Atom Packs Nanu X25, choosing the relatively heavy X10 Cotton Duck by Dimension Polyant (DM) for the main body and 500 denier nylon for the back panel and shoulder straps.
DM’s X10 Cotton Duck is interesting. It’s a 100% cotton fabric with polyester X-PLY yarn reinforcements at 22 degrees off the warp and a polyester film laminated to one side. The upshot is a fabric that looks and feels traditional (think Carhartt jackets) but performs at a high technical level (extremely durable and waterproof, if not the lightest thing around).
X10 Cotton Duck started showing up in bikepacking bags because – I imagine – it’s not going to tear the first time it rubs up against a thorn bush at 20 MPH. So it makes sense that Atom Packs would choose it for a pack they assume you’ll be biking around with (more on that later). Based on my experience with and knowledge of fabrics, I have to assume the Atom Pack Nanu X25 is going to age beautifully in a way that synthetic fabrics don’t. And from a purely aesthetic standpoint, the pack succeeds right out of the box. X10 Cotton Duck seems to come in the kind of pleasing, toned-down natural colors I’d prefer to see more of in technical gear (please spare me more neon shades of green, blue, and pink).
I should note that DM has discontinued X10 Cotton Duck. I reached out to Atom Packs to see what they’d make the next run of Nanus out of (currently slated for sometime this summer). The answer is – they aren’t sure. It will be interesting to see if they stick with a natural fiber + laminate model (X-Pac has a variation called X11) or move towards something a little more traditional. The fabric choice adds a lot of character to the Nanu, so personally speaking, I’d think of it as a loss if Atom Packs went with something purely synthetic like ECOPAK.
As a final nod towards durability, Atom Packs opts for a Dyneema Composite Fabric-reinforced stretch material that is likely to hold up well against rips and tears. This fabric choice seems a good compromise between the utility of traditional nylon stretch pockets and the durability of open-weave mesh.
Multi-use feature set
The Atom Packs Nanu X25 is essentially a miniaturized version of a three-pocket ultralight pack. It has a roll-top closure with a g-hook tensioner and a single over-the-top webbing strap. There’s a stretchy shoulder-strap pocket on the left-hand shoulder strap that’s big enough to accommodate my iPhone 12 Pro Max or my 650 ml water bottle.
The Nanu X25 also has a shock-cord trekking pole attachment system and two shock-cord compression tensioners on either side of the upper pack. This classic ultralight backpacking feature set gives the Nanu X25 the chops for all-day excursions and quick one-night overnights – provided you have a low-volume kit. A stiff foam back panel lends just a touch of structure, while a line of daisy chain webbing running down each shoulder strap provides attachment points for other incidental gear.
The side pockets are cut at an angle. Usually, this design choice denotes a nod towards on-the-go accessibly. I almost never find such pockets practically accessible, and the pockets on the Nanu X25 are no different. It’s possible to fish a water bottle out of them with some contorting, but why bother when you’ve got a shoulder strap pocket right there?
Additional features expand the Nanu 25 capabilities beyond backpacking and hiking. There’s a zip pouch right above the shoulder straps that includes an integrated key clip, a laptop sleeve padded out by the foam back panel, and an internal pocket with a snap closure. A webbing loop sewn into the fabric below the rear pocket provides a handy bike light attachment point. These features make the Atom Packs Nanu X25 an attractive option for the user wanting a day pack that performs at a technical level while also doubling as a commuter or travel pack.
Construction and finish quality
The Atom Pack Nanu X25 features seams that are triple stitched and bound. The hardware and webbing loops are bar-tacked into place. Between these construction choices and the material choices discussed above, I’d classify the Nanu X25 as overbuilt, and I mean that in a good way.
In his Performance Review of the Atom, Dan Durston gave Atom Packs high marks on some, but not all, of his finish quality metrics. Looking over his observations and comparing them to this pack, I’d say Atom Packs has upped its game. There’s one line of stitching with a little wiggle – nothing the average user would be likely to notice.
There’s a lot to love about the Atom Packs Nanu X25. It’s a technical pack that doesn’t look or feel like a technical pack. It’s got just enough volume to make a low-volume overnight trip possible but maintains a sleek design that rides comfortably while hiking or biking. The aesthetics are enhanced by attractive material choices that also happen to be durable and waterproof. The overall construction is well-realized.
It is, unfortunately, pretty expensive for a day pack, coming in at ~$269 at the exchange rate as of this writing. That kind of price tag is likely to be offputting to anyone with a daypack that is still doing the trick. But if you happen to be in the market for a new daypack and you’d like it to be one that can replace a few of your other bags as well, you could do worse than considering the Atom Packs Nanu X25.
Atom Packs is out of stock at the moment, so you’ll have to look around on the second-hand market to purchase one. Atom Packs tells me they’ll be tackling another run of this pack sometime in the summer of 2022.
Browse our curated recommendations in the Backpacking Light Gear Shop – a product research & discovery tool where you can find Member gear reviews, Gear Swap (used gear) listings, and more info about specific products recommended by our staff and members.
Gear Shop » Frameless Backpacks
- Read more by Andrew Marshall.
- Check out Dan Durston’s review of the Atom by Atom Packs.
- Read this thread of Backpacking Light community members discussing their favorite day packs.
DISCLOSURE (Updated November 7, 2019)
- Product(s) discussed in this article may have been purchased by the author(s) from a retailer or direct from a manufacturer, or by Backpacking Light for the author. The purchase price may have been discounted as a result of our industry professional status with the seller. However, these discounts came with no obligation to provide media coverage or a product review. Backpacking Light does not accept compensation or donated/discounted products in exchange for guaranteed media placement or product review coverage.
- Some (but not all) of the links in this article may be “affiliate” links. If you click on one of these links and visit one of our affiliate partners (usually a retailer site), and subsequently place an order with that retailer, we receive a small commission. These commissions help us provide authors with honoraria, fund our editorial projects, podcasts, instructional webinars, and more, and we appreciate it a lot! Thank you for supporting Backpacking Light!
- Read about our approach to journalistic integrity, product reviews, and affiliate marketing here.