The 250ml soft flask isn't just a small water bottle - it's a game-changer for ultra runners. Fill it with 5-6 energy gels, add a splash of water, and you've got mess-free nutrition that lasts for hours. No more fumbling with sticky packets at 20 km. No more trail litter. Just smooth, continuous energy exactly when you need it. Made from food-grade TPU that's BPA-free and built for thousands of squeezes.
Why South African Runners Choose Soft Flask 250ml
Community-Driven Brand
We're not just a company - we're part of the running community. You'll find us at events like the Two Oceans Marathon, supporting athletes and testing gear on real trails.
Local Support
Based in Paarl, Western Cape, with nationwide shipping across South Africa. Fast delivery, local customer service.
Proven Performance
Trusted by trail runners from Cape Town to Johannesburg. Built for South African conditions - from Drakensberg winters to Karoo summers.
Why TPU Matters for a 250ml Flask
-
For Gel Storage
Energy gels are acidic and contain citric acid, which can interact with low-grade plastics. TPU is chemically inert and won't leach plasticizers or BPA into your nutrition, even after hundreds of refills.
-
For Temperature Resilience
Whether you're mixing cold gels for a summer ultra or carrying water for a winter trail run, TPU maintains flexibility from -20°C to +40°C. PVC becomes brittle and cracks in cold conditions.
-
For Safety
The same TPU used in medical catheters and IV bags. If it's safe for direct bloodstream contact, it's definitely safe for your energy gels and water.
-
For Durability
The 250ml size experiences more "squeeze cycles" than larger flasks (you'll squeeze it more frequently for sips). TPU's superior elasticity means it can deform and recover millions of times without developing stress fractures.
How to Use Your Soft Flask 250ml
Pro Tip: Mix different gel flavors for variety, or combine with electrolyte powder for a custom energy drink.
Squeeze 5-6 individual gel packets into the flask
Add 20-50ml of water (optional) to thin the mixture
Shake well to combine
Squeeze out excess air and seal
Take small sips throughout your run
Maintenance Tips for Long Life
- Rinse after every use, especially with electrolyte drinks
- Dry completely before storage (freeze upside-down or use whisk trick)
- Use lemon juice or denture tablets to remove any initial manufacturing residue
- Store without cap on to prevent mold growth
- Replace valve every 6-12 months depending on usage
500ml vs 250ml: Which Size Do You Need?
The Workhorse
Your go-to for longer runs and race day
- Runs over 10km
- Race day hydration
- Vest-based carrying systems
- Water + separate electrolyte bottle setup
The Minimalist
Perfect for short runs and gel storage
- Short runs (5-10km)
- Handheld or belt carrying
- Energy gel storage (holds 5-6 gels)
- Minimalist pocket hydration
How to Master Your 250ml Gel Flask
Best Gel-to-Water Ratios
- Thick & Concentrated: 5-6 gels + 0ml water (original gel consistency)
- Medium Flow: 5 gels + 30ml water (most popular)
- Liquid Energy: 4 gels + 50ml water (easiest to digest during hard efforts)
Flavor Mixing Ideas
- Chocolate + Espresso Mocha Energy
- Strawberry + Lemon Berry Blast
- Vanilla + Electrolyte Powder Salted Caramel
Cleaning After Gel Use
- Rinse immediately after your run (gels get sticky if left to dry)
- Use warm water with a drop of dish soap
- Shake vigorously, then rinse thoroughly
- Dry completely before storage (freeze upside-down trick works great)
Pre-Race Prep
Fill your flask the morning of the race and store in your hydration vest or drop bag. Most gels remain stable for 24 hours without refrigeration.
Frequently Asked Questions About Soft Flask 250ml
No! TPU is chemically resistant to the citric acid and preservatives in energy gels. Unlike cheap PVC, it won't degrade or develop cracks from gel exposure.
Comfortably 5-6 standard 30-40g gel packets. That's 150-240g of carbohydrates - enough for 2-4 hours of hard running depending on your fueling strategy.
Absolutely! Many runners create custom blends. Just be aware that different brands have different viscosities - you may need to adjust water content.
For runs under 10km or 60 minutes in moderate weather, yes. For longer efforts or hot days, you'll want a 500ml flask or dual flask setup.
Yes! The 250ml size is specifically designed to fit waist belts like FlipBelt, Naked Running Band, and similar products without creating excessive bulk.
Give the flask a quick shake before taking a sip if you've added water. The bite valve naturally mixes as you squeeze.
TPU can handle warm liquids, but we recommend keeping temperatures below 40°C. Not suitable for boiling water.
With proper cleaning after each use, expect 2-3+ years. The TPU is highly durable and won't degrade from repeated gel exposure like cheaper materials.