Kailas Fuga Air 2.0 Review: A Lightweight Hydration Vest That Punches Above Its 8 Liters

Introduction

Kailas has been quietly building a reputation with its mountain trail running gear, and the Fuga Air 2.0 is the brand’s take on a lightweight hydration vest. After a couple of weeks of testing on shorter efforts and two long runs of three to four hours, it has proven itself to be a genuinely capable piece of kit that competes with some of the most established names in the category.

At 8 liters of storage and a claimed 210 grams in a medium, this vest sits firmly in the lightweight race-and-fast-training bracket. It retails for $159, around 130 British pounds, which puts it right alongside the Salomon Advanced Skin 12 Set, a vest many runners still treat as the benchmark for fit and accessible storage.

Who This Vest Is For

The Fuga Air 2.0 suits trail and mountain runners who want a breathable, low-bounce vest for long training days and races with mandatory kit requirements. If you are buying your first hydration vest, or upgrading from something heavier and warmer, this is an easy recommendation. Runners who prefer minimal volume for short summer efforts may want less storage, and those needing very large capacity should look elsewhere in the Kailas range, which covers both directions.

First Impressions and Testing

Testing covered several shorter runs of seven to eight miles plus two longer efforts of three to four hours, including a first outing straight out of the bag that lasted three and a half hours with no chafing or irritation. The construction is soft against the skin and the honeycomb fabric keeps air moving well, which makes hot-weather running noticeably more comfortable.

Specs at a Glance

• 8 liters of storage volume across multiple front and back pockets
• Two 500ml soft flasks included, stored in the chest pockets
• Rear bladder compartment for those who prefer that system (bladder sold separately)
• 210 grams in a medium
• Available in small, medium, and large
• Around 10 colorways to choose from
• Retail price of $159, roughly 130 British pounds

Construction and Fit

Kailas uses a 3D coating in the construction to deliver a precise fit and even weight distribution, which helps comfort and mobility when the vest is loaded. The majority of the body uses a highly breathable honeycomb fabric aimed at airflow in hot conditions. The overall feel is closer to the early lightweight Salomon S/Lab vests: soft, minimal, and unobtrusive even when fully loaded.

Storage: More Pockets Than the Spec Sheet Suggests

The standout strength here is storage. Despite being marketed as an 8-liter vest, it swallows an enormous amount of kit, and every pocket is segregated so you know exactly where things live rather than rummaging through one large sack.

On the front, each bottle pocket gets a top bungee plus a secondary mid-pocket bungee that compresses as the flask empties, holding bottles secure with no slippage. The right side adds a good-sized stuff pocket for gels and bars, a smaller pocket with an internal divider and key loop, and a zippered phone-sized pocket. The left side has a larger lower double pocket. Both shoulders carry small stuff pockets that work well for a head torch, batteries, or a spare camera, plus tiny top pockets best suited to genuinely small items.

The back continues the theme: a large high stretchy compartment for mandatory kit in a dry bag, a separate folded-pocket slot for a waterproof jacket, a lower stretchy compartment for bulkier winter layers, and a lower zip pocket that doubles the secure-carry volume. On a demonstration pack, a full 100-mile mandatory kit list, including waterproofs, survival bag, first aid kit, warm layers, gloves, hat, whistle, gels, bars, and hydration, fit with room to spare.

The ADF Closure System

The front closure is what Kailas calls ADF, the All-round Dialed Fit. Three plastic clips connect the front, and a small dial mechanism, similar in feel to a Boa system, cinches the vest down with high-strength, low-resistance yarns. Slide beads keep the laces from tangling while clipping in.

This matters more than it sounds. As you drink down your bottles, most vests start to feel loose and bouncy. With ADF, a couple of quick turns on the wheel re-tensions the whole vest to your body shape. It initially seems like a gimmick, but in practice it works very well and keeps movement under control through an entire run.

Performance: What Works

• The included soft flasks have a wide opening for tabs and drink mix, a slightly angled nozzle you can reach without taking your eyes off the trail, and a push-down lock that prevents leaks in transit.
• The dual bungee system on the bottle pockets eliminates bottle movement as you drink, a small detail that removes a common annoyance.
• Comfort is excellent, with no chafing or irritation even on a first three-and-a-half-hour run straight from the box.
• Breathability is strong thanks to the honeycomb fabric.
• The front-and-back bottle-plus-kit weight balance genuinely runs better than a rear-only bladder setup, and topping up bottles at race checkpoints is far easier.

Things to Consider Before Buying

• Sizing is limited to small, medium, and large. If you need an extra small or extra large, this vest is not currently an option.
• The closure laces can tangle if the vest is stored loose after washing. Clipping the attachments back in before packing the vest away solves it, but it is a minor chore.
• The bladder system is supported but not included, so rear-hydration fans need to buy one separately.

Buying Advice

If you are shopping for your first hydration vest, or want an upgrade to something lighter and more breathable, the Fuga Air 2.0 deserves a place at the top of your shortlist. It is well constructed, thoughtfully organized, and right up there with the best vests I have used. If 8 liters is too much or too little, Kailas offers an extensive range of running packs and vests at other capacities, so it is worth checking their website before deciding.

Conclusion

The Fuga Air 2.0 is proof that an 8-liter label can hide a remarkably versatile carrying system. With excellent comfort, a clever dial-based fit system, secure bottle storage, and pocket space that handles a full mountain race kit list, it stands shoulder to shoulder with the established leaders. The limited size range and the occasional lace tangle are the only real complaints, and neither outweighs how well this vest performs on the trail.