GSI Quik Straw
Here's what other sites are saying:
Clever self-stowing straw collapses with a simple turn of the lid and auto-deploys in the blink of an eye. Lightweight silicone straw system adds a mere 0.6 oz. to your favorite bottle unlike other straw designs which weigh over 61% more. That really bites. Includes 3 straws which can be cut to length to fit all your favorite Wide-Mouth Water Bottles.
- Ramsey Outdoor