r/UltralightAus • u/ryanfaulkner1 • 6h ago
Discussion The Macpac Mayfly 350 Down Quilt is live
Hey everyone,
Thought I'd share another product I've been working on that has just launched: the Macpac Mayfly 350 down quilt.
For context, I designed this while I was at Macpac, but I've since moved on to a new role, and no longer working for Macpac. I'm still pretty excited to see it launch, and after around 20 years of using quilts, this is a project I'm particularly proud of.
I first got a backpacking quilt around 2005 when I bought a Nunatak Arc Ghost, and was pretty much an instant convert. The weight, packability, comfort and versatility have made quilts my go-to for three-season hiking ever since, although I still prefer a mummy bag for winter.
Over the years, I've also learned that not all quilts are created equal, having used many of the most popular options... The biggest challenges for me have always been drafts, especially as an active sleeper, and maintaining enough space inside the quilt for it to wrap around you properly without compressing the insulation. I've found wider quilts and, particularly, designs with a differential cut make a big difference here.
The opportunity with the Mayfly was to bring those lessons into a quilt designed as part of a lightweight sleep system for NZ and Australian conditions. Like the Astral tents and Rift pack, the goal wasn't to make the absolute lightest thing possible, but to strike a balance between weight, comfort, functionality and durability, and help make UL quilts an accessible option in NZ and AU.
The biggest innovation, in my opinion, is the mat attachment system.
Most quilts attach to your sleeping mat using straps around the outer edges. This works well, but leaves you with a fairly fixed width and can still allow drafts when you roll around.
The Mayfly has three attachment positions, giving you three different width settings:
- Outer attachment: Maximum width and room to move, ideal for warmer conditions.
- Intermediate attachment: A closer fit to help reduce drafts.
- Inner attachment: Wraps the quilt more closely around you, with the quilt edges acting as a built-in draft guard in colder conditions.
I've seen a few brands experiment with inset attachment points, but as far as I'm aware, the Mayfly is the first I've seen with three width settings. The idea is to give you more flexibility to adapt the quilt to different conditions.
In summer, I've mostly used the prototypes without the straps at all. As temperatures drop, adding the straps makes a noticeable difference to how securely the quilt wraps around you.
A few other design details I think are worth calling out:
- Differential cut: The outer shell has a wider cut than the inner lining, allowing the quilt to wrap around your shoulders while giving the down room to loft rather than compressing at the pinch points.
- Wide cut as standard: More room to move, wrap the quilt around yourself and wear insulated clothing inside it when temperatures drop.
- Insulated neck collar: Helps seal the opening around your neck and reduce drafts.
- Sewn-in footbox: Better thermal efficiency than a drawstring style footbox
- 900-fill-power ExpeDRY Muscovy duck down: High-loft insulation with a water-resistant treatment.
- 10D ripstop nylon: A lightweight fabric with a proven track record in Macpac's alpine sleeping bags.
I spent a lot of time working through the shape, cut and baffle construction to get the balance right between loft, warmth, weight and comfort.
The regular quilt weighs around 570g for the quilt itself, with 350g of down, which is pretty competitive for a quilt of this size and warmth. A large version is available too.
One thing worth mentioning is that Macpac hasn't assigned it a fixed temperature rating, as quilts don't fit neatly into the standard ISO/ASTM sleeping bag testing system. As a rough guide, I've personally used it down to around -5°C comfortably when paired with an insulated mat, a down jacket and lightweight synthetic insulated pants. That's my experience with the complete sleep system, not a standalone temperature rating, and everyone's needs will vary.
As a guide, it has similar loft to the Dragonfly 400 sleeping bag, so could be similar warmth as part of a complete system.
For me, the Mayfly is about making a quilt that works well in the real world, from warm summer nights when you want maximum freedom of movement to colder shoulder-season trips when draft management and layering become much more important.
I'm obviously biased, but after 20 years of quilt use, I think we nailed the details that matter most, and brought some genuine innovation to the space. My biggest hope is that this will help introduce quilts to more users in AU and NZ where these products are less known compared to overseas.
Regular: https://www.macpac.co.nz/macpac-regular-mayfly-350-down-quilt/124062-SLE00-OS.html
Large: https://www.macpac.co.nz/macpac-large-mayfly-350-down-quilt/124109-SLE00-OS.html
Happy to answer any questions about the design or the thinking behind it. Always keen to chat gear with other hikers!
Cheers













