A trail vest has long cost half a month's grocery budget just to get started. Decathlon sells the Kiprun 500 5L for €39.99, with a 1-liter water bladder included. At RunMorph, we read through the independent tests available on this model to find out what that price really sacrifices, and who it actually suits.
© Kiprun, official photo used for editorial purposes
The Kiprun 500 5L is Decathlon's entry-level trail vest for runners discovering the sport, sold at €39.99 with a 1-liter water bladder included. Independent testers unanimously praise the value for money, but flag limited support on technical descents and a one-size fit that doesn't suit smaller frames well. At RunMorph, it's the vest we recommend for a first season of solo outings, not for racing or rugged terrain.
The trail vest market has been structured from the top down for five years. Salomon, Raidlight and Compressport sell pieces at €150 or €200, designed for ultra distances and mandatory UTMB gear lists. Between those references and a plain hiking backpack, there was no honest entry point for a runner who wants to try trail on a one- to two-hour outing. The Kiprun 500 5L fills that gap at €39.99, with a 1-liter water bladder included from the factory, something no competitor offers at this price.
The brand isn't chasing performance. The 500 is the entry-level number in the Kiprun range, aimed at beginners, far below the race-oriented 900 Race. That positioning shows everywhere in the spec sheet: no pole loops, a simple fabric, a single size. Decathlon's bet isn't to rival a premium vest, but to remove the last financial excuse for someone hesitating to get started.
| Spec | Value |
|---|---|
| Brand | Kiprun (Decathlon) |
| Capacity | 5 L |
| Weight empty | 180 g (without water bladder) |
| Size | One size, chest 81 to 113 cm |
| Pockets | 7 pockets across 3 compartments (4 front, 3 rear) |
| Water bladder | 1 L included (30 x 16 cm, adjustable 100 cm tube) |
| Soft flasks | 2 slots for 250 ml flasks, flasks not included (€9.99 a pair) |
| Pole loops | No |
| Safety | Built-in 110 dB whistle |
| Fabric | Polyester + elastane, polyurethane/polyester lining, water-repellent |
| Colors | Smoked black / carbon grey, also green |
| Price | €39.99 |
At 180 grams empty, it's light for a vest that already includes a water bladder, a feature many €100 models still sell as an add-on. The trade-off shows up elsewhere: one size for everyone, no pole loops, and a water-repellent fabric rather than a waterproof one. Decathlon doesn't publish any data on water resistance beyond that generic term.
© Kiprun, official photo used for editorial purposes
Decathlon sells two 5-liter vests under the same brand, and the confusion is easy to make. The Kiprun 900 Race 5L targets racing, the 500 targets discovery. The table below settles it.
| Criterion | Kiprun 500 5L | Kiprun 900 Race 5L |
|---|---|---|
| Price | €39.99 | About €50 |
| Weight | 180 g | 190 g |
| Water bladder included | Yes, 1 L | No |
| Positioning | Discovery, short outings | Racing, race day |
| RunMorph score | 7.3 / 10 | 8.3 / 10 |
The 900 Race handles fast running better, which justifies its higher score. But it costs ten euros more and doesn't include a water bladder, an extra expense for anyone starting from zero. For a first solo outing on an easy trail, the 500 remains the logical choice.
A one- to two-hour introductory outing on a rolling trail, with no particular technical difficulty: that's exactly the terrain this vest was designed for. The included 1-liter water bladder saves you from having to buy flasks right away.
For an active walk or a few hours of fast-hiking, the capacity and hydration are more than enough. Lightness matters more than stability at this pace.
Before putting €150 into a premium vest, checking whether you actually enjoy trail running with a €40 product is a sensible approach. Several aggregated reviews on Outzer say exactly that: a vest to see if the activity suits you, before moving up a tier.
This is where the price gets paid. A detailed French test, scoring each criterion out of ten, gives the support only 6.5/10 and flags a precise issue: on a fast descent, the vest shifts if the side straps aren't cinched all the way. Aggregated reviews on Outzer partly confirm this: one advanced tester describes a vest that's "extremely light, practical and comfortable" with no reservations, while another reports that same shifting on technical descents when the fit isn't perfect.
The one-size design makes the problem worse. Built for a chest measurement of 81 to 113 centimeters, it covers a wide range on paper. In practice, a smaller frame never gets the cinch that someone in the middle of that range gets. The detailed test also notes back heat build-up on long outings, consistent with a simple fabric rather than an aerated technical mesh.
In plain terms: on a rolling trail at a moderate pace, the support is sufficient. As soon as the terrain drops off steeply or the pack is loaded, the difference with a €150 vest is felt immediately.
© Kiprun, official photo used for editorial purposes
Seven pockets across three compartments is generous for this price. Up front: a zippered pocket for a smartphone, two flask slots, and a pocket for gels or bars. At the back: a secured pocket for keys and a survival blanket, and a kangaroo pocket for a windbreaker.
The detailed test mentioned above rates the layout only 6/10 and points to a concrete flaw: the front smartphone pocket isn't rated as practical in use, too small or poorly placed for a quick mid-run grab. Decathlon has since fixed part of this issue: the current product listing advertises a secured, dedicated zippered phone pocket, an improvement over the generation that source tested. At RunMorph, we note that a genuine 110-decibel whistle is built in as standard, a safety detail some €100 vests still overlook.
© Kiprun, official photo used for editorial purposes
A 1-liter water bladder included from €40, with an adjustable 100-centimeter tube: that's the one feature that justifies the price against the direct competition. Two slots for 250 ml soft flasks round out the system, but the flasks themselves aren't included and cost €9.99 a pair at Decathlon.
For a one- to two-hour outing in mild weather, 1 liter plus two optional flasks covers the need comfortably. Beyond that, you'll either need to refill the water bladder on the way or switch to a higher-volume vest such as the Kiprun Bag 900 10L.
RunMorph's advice: cinch the side straps all the way before heading out, even if it feels too tight at first. It's the only adjustment that compensates for this vest's lack of fine-tuning. If you plan to carry more than 2 kg or descend fast on technical terrain, look instead at a Salomon Adv Skin 12 or a Raidlight Ultralight 12L.
© Kiprun, official photo used for editorial purposes
This vest matches exactly the outings a beginner plan builds first: 45-minute to 1h30 runs on varied terrain, before tackling longer distances. To structure that progression without getting hurt or over-equipped too soon, the RunMorph beginner training plan paces your outings around a hydration load this vest covers comfortably.
The Kiprun 500 5L does what a €40 vest can reasonably do: a water bladder included, a decent weight, well thought-out pockets for the essentials. It doesn't do what a premium vest does: hold firm on technical descents, fit every body shape, carry poles. For a first season discovering trail on easy terrain, it's a purchase that makes sense. For running fast or carrying a heavy load, it isn't the right product, and it isn't what Decathlon claims to sell at this price either. Overall score 7.3/10.