Burners

User guide

Fabric
40gsm nylon ripstock fabric. This is genuine 'parachute' surplus fabric from a narrow(ish) loom. As a parachute fabric, by design, it's relatively air-permeable, compared to the wind-proofed/DWR'd option I used on the Burners.
I've chosen this b/c it doesn't trap a layer of moisture on your back, will dry quickl
However! This also means it's not water/weatherproof, and your own sweat will saturate the contents. If you have dry or valuable kit/food, use a ziplock bag inside to keep it dry.
It's a nice silky, slippy quality, which wears well, becoming more matt and papery over time.
No special care instructions; wash as any technical fabric, cool iron will drop creases out, reducing laundering/mild laundering will extend the life of the product.

Straps
After a lot of thought, testing and trials, the focus came back simplicity. I tried a few different options on the straps, with 15mm friction adjusters, elasticated sections etc, but kept coming back to these static straps; if you need it shorter, tie a loop in it.
For the chest stabilising strap, same, tie a loop in to shorten. The clip is nice and petite .....but no good if it's 3am and you're trying to open with a cold gloved hand; just add your own carabina. Similarly, if you want some stretch and bounce in this chest strap, loop a hairband onto the base.
Backpack straps are set to what I'd call 'Large'; these work well on me as a 6'4" male, on and off-bike. If you think you'll need longer, please let me know and I can sort, no worries.
Some feedback has been that the backpack might benefit from a chest strap; I'm a little cautious to be too prescriptive on it's use, so simply use a micro-caribena if needed (add a headband loop for stretch)

Use case
As above these bags came out of a few directions, my main one being how bad drawstring bags look when they have any contents, and how bulky a standard musette is when folded, yet how inefficient/awkward the useable space is.
The small size/weight mean these are great for anything & everything, on and off-bike.
If you're just carrying a rainkjacket, flapjack and face-covering in your bar-bag, replace it with one of these.
Perfect on a trip for when you're leaving the hotel in the morning, easy to collect/carry all the faff you need for the day to bike, and not been slipping down the stairs in cleats while juggling bidons, computer, mitts - and a room key with a huge wooden marmot fob.
And similarly; the backpacks came out the need for a 'Mountains Bag' on Cent Cols Challenge to contain everything you need to go from 25º sea-level > 2000m 0ºC multiple times over 200km. You can see Phil Deeker wear-testing an early sample here
Or maybe just a post-ride offie raid, to go the park
A 21st century take on a foraging bag, for what you can glean from Pret on the office lunchbreak.

.....As promised a few days back, I'll post some more photos later, and show the straps alterations/adaption.