the OMM TrailFire Vest + 2 x 350ml Flexi Flask

the OMM TrailFire Vest + 2 × 350ml Flexi Flask

See our entire range from the OMM here!

The OMM TrailFire Vest + 2 × 350ml Flexi Flask is a stripped-down, ultra-light running vest , designed for everyday workouts, quick trail runs and shorter runs where you just want to carry the bare essentials – comfortably and securely. The vest comes complete with two 350ml flexi bottles , making it a convenient grab-and-go solution ready straight out of the box.

The TrailFire vest is ergonomically designed to carry weight across the shoulders and midsection , ensuring that your lungs are not restricted while running . The fit is close to the body and more like a garment than a backpack – stretch mesh and soft edge bands keep the contents close to the body and minimize bounce , even on technical terrain and at high heart rates.

Despite its minimalist design, the vest offers seven easy-access pockets on the front for energy, phone and small items, as well as a 3-liter mesh pocket on the back for an extra layer or gear that doesn't require immediate access. The back pocket can also be used for a hydration bladder up to 2 liters , making the TrailFire flexible enough to scale up for longer runs if needed.

For hydration at the front, the vest has space for up to two soft flasks and is supplied here with 2 × 350 ml OMM Flexi Flasks . The vest is also compatible with larger bottles (up to 500 ml) , depending on preference. With the UGR – Universal Gear Rail, the capacity can be easily expanded, for example by combining the vest with the Compressor Pod for an additional 5 liters of pack volume .

Features & Benefits

Ultralight (approx. 175 g) – barely noticeable while running

Supplied with 2 × 350 ml Flexi Flasks – ready to use straight away

Ergonomic design – stabilizes without restricting breathing

7 front pockets + 3 L back pocket – smartly distributed storage

Minimal bounce – stretch mesh keeps gear close to the body

Expandable capacity – compatible with OMM Pack Accessories

Features

Running vest with performance fit

2 × 350 ml Flexi Flasks included

7 easy-access front pockets

3 L mesh pocket at the back (jacket or hydration bladder)

Space for a hydration bladder up to 2 L

Secure zippered pocket

UGR – Universal Gear Rail

Reflective details for visibility

Breathable 3D mesh in the harness

Technical specifications

Volume : 3 L

Weight : approx. 175 g (lean weight)

Hydration : 2 × 350 ml Flexi Flasks (included)

Max bottle size at the front : up to 500 ml (depending on bottle)

Hydration bladder : compatible up to 2 L

Material : 3D mesh, stretch mesh

Sizes : S, M, L

Suitable for

Everyday training, trail running, shorter races and quick mountain hikes – for those who want to run easily, freely and without unnecessary packing .

Care instructions

Rinse the bottles after each use. The vest can be machine washed on a gentle cycle according to the manufacturer's instructions. Air dry.

The OMM TrailFire Vest is a body-hugging unisex running vest that comes with two 350ml Flexi Flasks. Choose your size based on your chest circumference and how tight you want the vest to fit.

Size chart

The size ranges overlap slightly, allowing you to choose a more body-hugging fit or extra space for clothes and gear.

How is the OMM TrailFire Vest sized?

The TrailFire Vest has a close-fitting performance fit and is designed to sit close to the body to minimize movement and bounce during your run. The fit is unisex, so use your measured chest circumference instead of your usual clothing size.

The vest should feel stable over the shoulders and around the chest without restricting breathing. The fit is also affected by how much you pack and whether the included bottles are full.

Our size recommendation

• Choose the smaller size if you are in an overlapping range and want a very close fit over thin running clothing.
• Choose the larger size if you want more adjustment space or use the vest over a jacket and warmer layers.
• At a chest circumference of 94–95 cm, S gives a tighter fit, while M gives more room.
• At 105–106 cm, M provides a tighter fit, while L is better suited if you want more freedom of movement and adjustment.

How do you measure?

Measure the chest circumference around the widest part of the chest, just below the armpits. Keep the measuring tape horizontal and close to the body without pulling it tight.

Please measure over the clothes you would normally wear under the running vest.

Check the fit

Try the vest on with both 350ml bottles filled and with approximately the amount of gear you plan to carry. Adjust the straps in increments until the vest fits securely.

The right size means that:

• the vest doesn't bounce or slide when you run
• you can take deep breaths without pressure on your chest
• the bottles sit securely at the front
• the shoulder straps do not rub against the neck or armpits
• you can move your arms freely
• the fit works even when the back pocket is packed