AXEN 500ml Soft Flask running hydration bottles, Blue Pack of 2-500ml, collapsible TPU with bite valve

AXEN 500ML Soft Flask is a lightweight, foldable TPU hydration bottle designed for runners, cyclists, and hikers who need a compact, bite-valve water source.

This pair of 500 ml soft flasks are made from food-grade TPU and collapse flat when empty, making them easy to store in a hydration vest, belt, or pack. Each bottle includes a durable silicone bite valve with a dust cover and is BPA-free. The flasks are built for convenience on the move: they’re soft to squeeze for quick sips, simple to clean, and heat-rated for everyday outdoor use.

How do these soft flasks make mid-activity hydration simpler?

The soft TPU body compresses as you drink, so there’s no sloshing and no rigid bottle to wrestle with while moving fast. The bite-valve allows hands-free sipping and the dust cover keeps the mouthpiece clean between gulps. Because they fold flat when empty, they take up minimal space when you don’t need them.

• 500 ml capacity per flask for balanced weight and volume
• Compressible TPU design reduces liquid movement while running
• Silicone bite valve with dust cover for quick, hygienic access
• Collapses flat to save space in vests and packs

What materials and care should I expect for longevity?

AXEN soft flasks are constructed from food-grade TPU that’s BPA-free and rated for temperatures commonly encountered outdoors. The flexible material resists punctures and is easier to clean than multi-layer rigid bottles. Rinse with warm water after use and let air-dry fully with the cap removed to avoid lingering odors.

• Food-grade TPU, BPA/BPF-free for safe drinking
• Recommended temperature range: 0–60°C
• Simple cleaning: rinse, use mild detergent if needed, air-dry open
• Replace bite valve if damaged or leaking to maintain function

Can I use these flasks with hydration packs, belts or on their own?

Yes—their slim, flexible shape fits most running vests, hydration packs, and waist belts designed for soft flasks. When used standalone, the soft body and bite valve allow easy handheld sipping during short training sessions. The included dust cap helps keep the mouthpiece clean in pockets or mesh sleeves.

• Compatible with most soft-flask-compatible vests and packs
• Slim profile fits belt pockets and side sleeves
• Handheld-friendly for quick runs or walks
• Dust cover protects mouthpiece during transport

How does a two-pack improve training or event logistics?

Having two 500 ml flasks lets you alternate flavors or fluids—plain water in one and an electrolyte mix in the other—or use one as a spare. For longer outings you can refill at aid stations without losing access to hydration. A two-pack also gives families or teammates immediate extra capacity.

• Two flasks (500 ml each) provide backup and mix options
• Swap or refill one flask while keeping the other accessible
• Great for shared use in pairs or family activities
• Lightweight pairs reduce carried weight versus rigid bottles

Who is this for? The AXEN 500ML Soft Flask set is aimed at runners, cyclists, hikers, and outdoor athletes who prioritize low weight, compact storage, and fast, hygienic sipping while active. It’s also a practical choice for parents packing fluid for kids, commuters who want a collapsible backup bottle, or anyone who prefers soft-flask compatibility with hydration vests and belts.