The foldable TPU soft flask with an extension straw is a hands-free hydration solution for trail running vests and ultra-marathon backpacks. Featuring an industry-standard 42mm wide-mouth opening and an auto-seal silicone bite valve, our flasks are engineered for easy refilling, cleaning, and zero leakage. We manufacture 100% BPA-free, food-grade TPU hydration gear for B2B wholesale, providing full OEM/ODM services — including custom tube lengths and logo printing — for outdoor sports brands worldwide.
Engineering & Compatibility: Built for Professional Trail Runners
When B2B buyers source hydration gear, compatibility with existing backpacks is the most critical factor. Here's how our long-straw TPU flask is engineered to meet market demands:
- Universal vest compatibility: The slender, tapered body slides effortlessly into the front hydration pockets of major trail running vests (compatible with standard designs used by leading outdoor brands).
- 42mm wide-mouth opening: A major pain point with soft flasks is cleaning. Our standard 42mm opening makes it easy for end-users to add ice cubes or electrolyte powder, and allows quick cleaning and drying to prevent mold.
- Anti-leak auto-seal valve: The long straw uses a high-flow, medical-grade silicone bite valve that automatically seals after each sip, eliminating leakage during rigorous bouncing and downhill running.
Core Product Specifications
| Feature | Specification Details |
|---|---|
| Material | 100% food-grade TPU body & silicone valve |
| Standard opening | 42mm wide mouth (easy fill & clean) |
| Straw design | Flexible extension tube with auto-seal bite valve |
| Safety standard | BPA-free, PVC-free, odorless, FDA/LFGB compliant |
| B2B customization | Logo printing, specific tube lengths, and Pantone matching |
The B2B Supply Chain Advantage
Sourcing collapsible TPU hydration gear offers significant logistical benefits:
- Maximized freight efficiency: Empty TPU soft flasks pack completely flat, maximizing carton space and minimizing international shipping costs per unit.
- Durable OEM branding: Advanced silk-screen and heat-transfer printing ensures your custom logo withstands constant squeezing and extreme outdoor conditions.
B2B Sourcing FAQ
Do these long-straw soft flasks fit into standard hydration vests?
Yes. The dimensions and the tapered bottom are specifically designed to be universally compatible with the front stretch pockets of most standard trail running vests and ultra-marathon backpacks.
How do end-users clean the extension straw to prevent mold?
The design pairs perfectly with standard tube cleaning brushes. The 42mm wide mouth also lets runners easily flush out sticky electrolyte residues and air-dry the interior completely.
Can we customize the length of the extension straw?
Yes. Our OEM facility lets you specify the exact length of the extension tube to match the pocket depth of your brand's specific hydration vests.
Is the bite valve replaceable or detachable?
Yes. The silicone bite valve can be easily detached for deep cleaning or replacement, extending the overall lifespan of the hydration system.
Get Wholesale Pricing
If you're sourcing custom long-straw TPU soft flasks for your brand, contact us for wholesale pricing and custom samples.