Harrier Kinder 10L Race Vest Review: Affordable Trail Running Storage Done Right

Introduction

The Kinder 10L Race Vest comes from Harrier Trail Running, a small independent British company focused on quality trail running kit at an affordable price. That positioning matters, because the running vest market is full of options that cost considerably more, and the Kinder 10L undercuts most of them at £59 in the UK.

After a couple of months of testing, the picture that emerges is of a well-thought-out race vest that has been subtly but sensibly updated, with cleaner styling, better sizing and fewer annoyances than its predecessor.

Who This Product Is For

The Kinder 10L is a sized race vest rather than a one-size-fits-all running pack, and it comes in multiple sizes. That distinction matters: a sized vest tends to fit better and feels more comfortable to run in, especially over long distances.

It suits three broad groups: marathon runners who want to carry more water on long training runs, newcomers to trail running who need to carry extra kit for safety, and ultra runners looking for a carrying system for mandatory race kit across 50k, 100k or even 100 mile events, particularly on a tight budget.

Main Strengths

Storage on the Move

The front of the vest is packed with accessible storage: two small top pockets, one with a fold-down top and one with a more secure zip, elastic loops to hold soft flask straws in place, two large bottle pockets, two deep stretchy stash pockets for nutrition, gloves, buffs or head torches, and a big zipped pocket on each side.

The vest does not include bottles, but Harrier makes a 500ml soft flask designed to fit those pockets, with bungee loops to stop bottles slipping down as you drink. A bladder system also works, with a dedicated clip and compartment inside and a hose that routes out the back and up the front.

Back Panel and Carrying Options

At the rear there is a wide zip opening into the main compartment, a bungee cord system that cinches down lightly loaded kit to stop bounce, or holds extra items like waterproofs when fully loaded, plus high-visibility reflective detailing and two bungee loops at the base that work as a pole carrying system.

Fit, Adjustment and Breathability

Despite being a sized vest, it still offers personal adjustment: two fully adjustable elasticated chest straps with substantial clips, an emergency whistle built into the top clip, and a hook and loop system that lets you reposition the straps up and down to tailor the fit to your body shape.

The back uses a layered mesh construction similar to some Salomon packs: two layers of mesh with a thin foam layer between them, which lifts the pack away from the body and creates a cavity that aids airflow and breathability.

What Has Changed in the New Version

The update is subtle, with most features carried over. The most noticeable change is sizing: the new sizes appear slightly bigger, and the new medium fits better than the snug original, especially when carrying minimal kit, when the old version sat high on the back and tight around the neck and shoulders.

Fabrics have changed too, with a lighter, more breathable material across the top pocket area that gives the vest a more premium look and feel. The front zip pocket has been relocated higher up for easier access, the two stash pockets have more volume, and the whole vest has been stripped back: fewer loops, straps and bungees, and shorter, lighter zip pulls. On the original, long heavy pulls and loose cords bounced around on longer runs and needed constant tucking away; the new version removes that problem entirely.

Things to Consider Before Buying

The one clear drawback is the side pockets. Their openings are quite narrow and tight to reach into, and while the reinforced zip may be part of the reason, anyone with larger hands may struggle to get kit out. The previous version had a noticeably bigger opening. A wider pocket, or a stretchy mesh top opening like the front stash pockets, would solve this.

It is also worth noting that the front pole carrying system has been dropped from the new version, which is a shame for riders of running poles who like to keep them accessible on the front of the vest, though the rear bungee loops remain.

Buying Advice

At £59 the Kinder 10L is very affordable compared with other running vests and hydration packs on the market, and the build quality genuinely surprised on first inspection. If 10 litres feels like too much storage, Harrier has also updated its 5-litre Kerber race vest as a smaller alternative.

For a first hydration vest, or for an ultra runner who wants a well-considered mandatory-kit system without spending a lot, it is hard to find better quality or more thoughtful design for the money.

Conclusion

The new Kinder 10L Race Vest takes a good vest and makes it better: improved sizing, cleaner front storage, more premium-feeling materials and less bounce-inducing clutter. The narrow side pocket openings are the only real complaint, and even that is a manageable trade-off at this price. For trail runners who want a sized race vest that punches well above its price bracket, the Kinder 10L deserves a serious look.