UltrAspire Softflask

The locking cap features a simple twist-to-secure design that creates a positive, drip-free seal. Once locked, it prevents accidental opening or leaking, even when the flask is compressed inside a tight vest pocket.

The flask is constructed from high-quality, food-grade materials like TPU and silicone, which are designed to be taste-neutral. We recommend rinsing it thoroughly with warm water and a mild detergent before your first use to ensure a clean taste.

With dimensions of 29cm x 9cm x 6cm, this 1-liter flask is designed to be slim and flexible. It fits most standard hydration vest pockets, though you should check your vest's specific pocket dimensions to ensure it accommodates the 29cm length.

Yes, the flask is built from a blend of TPU, PP, and HDPE, which are chosen specifically for their flexibility and tear resistance. It is designed to withstand the repeated compression and movement typical of long-distance endurance activities.

The wide-mouth opening allows for easy access to the interior for rinsing. Because the material is flexible, you can invert the flask to dry it completely, which helps prevent mold and bacteria buildup between uses.

While it is primarily designed for water or electrolyte drinks, the flexible material and locking cap make it suitable for thicker fluids like energy gels. Just be sure to clean it thoroughly after use to prevent residue from clogging the cap mechanism.