Hydration

When trail running, you sweat a lot, especially in the mountains, in the heat, or during long efforts. Proper hydration helps regulate body temperature, prevent cramps, heat strokes, and drops in performance. Even slight dehydration can have an immediate effect on your energy level and clarity. It is therefore essential to drink regularly, before feeling thirsty, from the start of your outing.

- The soft flask is compact, light, empties gradually, and reduces jolts. It is perfect for trail vests: easy to slip into front pockets, with or without a straw.
- The water bladder is worn on the back and allows carrying a larger volume (up to 2 L), with a tube accessible while running. Ideal for long outings without refreshment points.
- The rigid bottle is easy to use, sturdy, and often used as a supplement or on short hikes.
The best approach is often to combine flasks at the front and a water bladder at the back depending on the duration and heat.

On average, plan for between 500 ml and 1 litre of water per hour of effort, depending on the temperature, intensity, and your level of sweating. In summer or in the mountains, it is better to be prepared and not set out under-equipped.

Raidlight flasks and bottles are available in several sizes (300, 350, 600, 750 ml), to suit your needs. Our bags/vests are compatible with water bladders up to 2 litres. Some models include filters or are compatible with filtering caps to draw from springs or streams during your run.

Yes, the Raidlight soft flasks are universal and fit most trail vests on the market. Their wide cap or long straw makes them compatible with most quick-access systems. Our water bladders are also standardized (classic valve, detachable tube) and fit easily into most hydration packs.

If you use a Raidlight pack, the compatibility is perfect. Otherwise, be sure to check the compartment dimensions to ensure a good fit.
All our vests come with the suitable flasks.