Raidlight Ultralight 12L Review: 200 g Made in France for 100 km

200 grams. For 12 liters. Sewn in Saint-Pierre-de-Chartreuse, priced at €159.90, shipped with two EasyFlask 600 mL. The Ultralight 12L replaces the Responsiv 12L and shaves 20 g off it. 84% recycled polyester fabric, Freelock system, certified for UTMB mandatory gear. The question isn't whether it's good. It's whether it holds up against the Salomon Adv Skin 12 when you take on an 80 km race.

Raidlight Ultralight 12L: the ultra-trail vest made in the Chartreuse

Raidlight is the French brand that pioneered trail running, founded by Benoît Laval in 1999 in Saint-Pierre-de-Chartreuse. Back when Salomon was still pushing classic backpacks on ultra runners, Raidlight invented the lightweight hydration vest. Twenty-six years later, the brand keeps doing what it does best: light trail vests, designed and sewn in France at its Chartreuse textile workshop, opened in 2014 and expanded to three sites in Isère and Savoie since 2025.

The Ultralight 12L replaces the Responsiv 12L (220 g) in the 2026 collection. Same size, same logic, but 20 g lighter and made from a more eco-friendly fabric. Raidlight's spec sheet lists it at 200 g, and several independent reviews carried out in France weighed it at 190 g. In the 12-liter segment certified for UTMB mandatory gear, it's one of the two or three lightest vests on the market, level with the Compressport UltRun S Pack Evo 10 (117 g, but only 10 L) and well ahead of the Salomon Adv Skin 12 (244 g).

RunMorph's advice. If you want a versatile 12 L vest that handles a 3-hour mountain long run as well as a self-supported 80 km trail race, and French manufacturing weighs in your buying decision, the Ultralight 12L is now the absolute benchmark under €200. It takes over directly from the Salomon Adv Skin 12 as the safe bet in the segment, with the Made in France argument and 44 g less on the scale. For shorter outings (1 to 2-hour runs), go for the NNormal Race Vest 5L or the Kiprun Bag 900 10L instead.

© Raidlight, official photo used for editorial purposes

Objective technical specs

Who is the Raidlight Ultralight 12L for?

You're targeting self-supported 50-100 km races: it's for you

12 L is the size built for UTMB mandatory gear + 1.2 L of water + 8-12 hours of nutrition + windbreaker + phone. No more, no less. Templiers, Maxi-Race Annecy 84 km, EcoTrail Paris 80 km: proven playground. Beyond 100 km at altitude, take an 18-20 L vest or you'll be crying by km 70.

You refuse to buy gear sewn in Vietnam: it's for you

Raidlight has been sewing in the Chartreuse since 2014. Three workshops in Isère and Savoie since 2025. €159.90 versus €165 for Salomon (made in Vietnam). If €5 makes you think twice about backing a French small business, buy a Kiprun instead. Lifetime repairs come with the Raidlight price tag.

You're tired of re-tightening your vest every 30 km: it's for you

Freelock solved a fit problem back in 2010, and nobody has copied it since. Two Boa-style dials on the sides, the same principle as ski boot and mountain bike shoe lacing. Tighten once, run for 6 hours, never touch it again. If you're still running with a plastic-strap vest in 2026, that's habit, not choice.

© Raidlight, official photo used for editorial purposes

Comfort, bounce and secure fit

A real vest. Not a backpack with shoulder straps. Wraparound cut, 100% polyamide mesh on the back and sides, body in recycled stretch polyester (84%) + elastane (16%). Put it on and it hugs you. Like a slightly stiffer technical tee, never like a classic pack.

Bounce is where it's won or lost. Side Freelock + two adjustable chest straps, and the load sits flat against your spine. Once it's dialed in, you forget it's there. Technical descents, jumps, surges: zero bobbing. Exactly what you want on an ultra.

The ultra-breathable mesh harness limits sweat buildup on your back. On runs above 25 °C, that's real comfort, especially compared with rival vests in denser fabric like the Black Diamond Distance 22, which favors fastpacking toughness over pure breathability.

Compartments and accessibility

9 pockets. All reachable on the run. Up front: 2 elastic flask pockets, 1 zippered phone pocket, 2 stretch pockets for quick fueling. In the back: 1 vertical main compartment with a wide zip opening (your rain jacket goes in within 2 seconds, which matters when a storm rolls in on a climb), 1 rear zippered pocket you can reach with the vest on, 1 hydration sleeve for 1.2-2 L with a Velcro retaining strap.

The detail that makes the difference: the big vertical opening. No more rummaging blind. You see what you pack, and you pack what you want. The pole holder is double, front AND back. Steep climb? Pull the poles out or stow them from the front without breaking stride. Flat section? Use the rear holder so the grips stay out of your way.

Compatible with the optional Raidlight +6 L quiver: you turn the 12 L into an 18 L for long self-supported races without changing vests.

Hydration

2 EasyFlask 600 mL in the box. 1.2 L up front, no extra accessory needed. Short 1h-1h30 trail run: covered.

Long trail race: add a 1.5-2 L bladder in the back (the Velcro strap holds it high, zero sloshing). The tube exits at the top, on the right or the left. Max total on board: 3.2 L of water, or 5-6 hours of range in temperate mountain conditions. For a 50-100 km race, that's generous between life bases.

A sore point: the bladder isn't included. On a €159.90 product, that's debatable. Budget €25 more for a compatible 2 L Hydrapak. The Kiprun Bag 900 10L, at €80, ships with one in the box. Stingy of Raidlight.

© Raidlight, official photo used for editorial purposes

How it stacks up against the competition

The 10-12 L ultra-trail vest segment is the most crowded in trail running. Here's how the Ultralight 12L compares with the three benchmarks already covered in our reviews:

The comparison Salomon loyalists won't like: out on the trail, the Ultralight 12L beats the Adv Skin 12 on three objective metrics (200 g versus 244 g, €159.90 versus €165, Chartreuse versus Vietnam). The only real argument Salomon has left is brand culture. Fifteen years of UTMB podiums, a testing network that would make any French brand blush. Fair enough. But here's what Salomon retailers won't tell you: Raidlight's side Freelock fixes a fit problem the Adv Skin has never solved. Tighten once, run for 12 hours, never re-tighten. With the Adv Skin, you re-tighten every 50 km. Minor detail? Ask a CCC finisher.

Against the Compressport UltRun S Pack Evo 10 (117 g, €170), the Ultralight 12L gives up 83 g but offers 2 more liters, front AND back pole holders (the Compressport only has a zigzag front holder), and a back bladder sleeve (missing on the UltRun S Pack, which bets everything on front flasks). The Compressport remains unbeatable for pure ultralight racing under 50 km. Beyond that distance, the Ultralight 12L takes over.

Against the Kiprun Bag 900 10L (240 g, €80), the Ultralight 12L costs twice as much but wins back 40 g, 2 L of volume, a Freelock that's more precise than a simple elastic cord, French manufacturing and a better overall finish (recycled stretch polyester versus standard polyester). The Kiprun remains the value-for-money benchmark for an ultra beginner or a recreational runner. The Raidlight takes over as soon as you want a vest that lasts 5 trouble-free years on serious races.

Against the NNormal Race Vest 5L (174 g, €135), it's a different league: the NNormal is a 5 L skyrace vest for 20-50 km races, the Ultralight 12L is a 12 L ultra vest for 50-150 km races. But on raw weight, the Raidlight comes out ahead: 200 g for 12 L versus 174 g for 5 L, a far better weight-to-volume ratio on the Raidlight side.

Which vest for which distance with RunMorph

The Ultralight 12L is built for the 50-150 km range in our RunMorph training plans. In practice:

On an 80 km trail plan (think Maxi-Race Annecy or Templiers), it's the vest for your long runs from 2h30 of effort, and it's your race vest on the big day. You don't need to switch gear between training and racing, which is a real factor for mental and logistical success.

On a 100 km to 150 km trail plan (think Trail Verbier-Saint-Bernard, Grand Trail Stevenson, Mont-Blanc Marathon), the Ultralight 12L works on race day as long as you play the closely spaced aid station strategy. Beyond that, on the UTMB itself, the CCC or the TDS, many runners switch to a 15-18 L vest to fit a parka, waterproof pants and a bigger water reserve between life bases. Adding the optional +6 L quiver can cover that need without changing your base vest.

For a road marathon or half marathon plan, forget it: this vest is too bulky. Go for a bottle belt or a 3-5 L mini vest like the NNormal Race Vest.

© Raidlight, official photo used for editorial purposes

RunMorph verdict

9/10. The best Made in France 12 L vest of 2026, and one of the three best ultra vests on the market, all segments combined. Period.

The lesson nobody will tell you: at just €6 from the Salomon Adv Skin 12, it's not the weight or the pockets that tip the scales. It's the Freelock. Once your side dials are set to the millimeter, you never go back to clip straps. Never. The rest of the market keeps tinkering with elastic. Raidlight solved the problem in 2010 and nobody has copied it since.

The real limits: the bladder isn't included (budget €25 more at Hydrapak), the unisex sizing penalizes very slim builds, and the fabric will give out before the 5 years a Dyneema vest lasts. You do the math.

Key takeaways for your training

• Target volume for 50-100 km: 12 L is the go-to format for short to mid-length ultras with mandatory gear, water and nutrition.
• Get used to the Freelock: test the fit empty on your first easy run, then loaded on a long run. You'll find the perfect setting within 2-3 runs.
• Long run = gear run: use every 3h+ run to dial in how you fill your pockets, how easily you reach your gels and how the vest holds under load.
• Front hydration: 1.2 L in the front EasyFlasks is enough for up to 1h30 of effort. Beyond that, add the 1.5 L to 2 L back bladder.
• Race = training: your ultra vest should have logged at least 80 km of long runs before you pin on your bib. No surprises on race day.