An air-filled cycling backpack designed to reduce drag that we told you about a couple of years ago does the exact opposite, according to aero products and testing service AeroCoach. Stunned, aren’t you? No, neither are we.
We told you about the Ram Air Fairing RAF1 in 2024 when it was crowdfunding, and again when it hit its Kickstarter funding target.
The “pioneering bike bag” designed by Hong Kong’s Ram Air Fairing is designed to be a giant fairing that you wear on your back.
When we wrote our second report, 18 people had pledged £31 apiece for the RAF1, and a couple of backers had pledged £62 for two of them. Two? In for a penny…

The project’s founders said that their “one-of-a-kind accessory… sets you apart on the road”. No arguments on that front. They also said the design represents the “next level of cycling safety and performance”. That claim is a little harder to swallow.
RAF said the 300g air-filled backpack boasts “unparalleled” efficiency and has been “meticulously engineered to elevate your speed on the road”. How? By “significantly reducing air drag”, apparently… although the designers gave no details relating to the scale of benefits they were claiming.
Luckily, AeroCoach – a UK-based company specialising in cycling aerodynamics – has bought an RAF1 and taken it to the wind tunnel for aero testing.
Here’s AeroCoach’s video. It’s not exactly positive, which is great news if you don’t want to look completely bizarre in your quest for speed.
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AeroCoach’s Xavier Disley says, “We’ve just published our video with the results; it was 15w slower on [wind tunnel rider] Jess in an upright position at 45km/h [28.0mph], and about 3.5w slower at 30km/h [18.6mph].”
Aerocoach apparently didn’t cut any corners here, tested across a range of yaw angles; a 10° sweep to simulate outdoor riding.

“Everyone who missed out on the crowdfunding, you haven’t missed out. It’s terrible. It’s going in a bin,” says Xavier Disley.
What about the “next level of cycling safety” claim? That’s not something AeroCoach addressed but, well, what do you think? We’re not seeing it.
At least you can carry loads of kit to the office in the RAF1, right, so all’s not lost.
Um, we’ve got some bad news for you there too: it’s not well-suited to carrying much at all.
In short, if you didn’t pledge £31 to the RAF1 Kickstarter campaign, it looks like you made a wise decision.
