450 ml Silicone Folding Water Bottle with Straw

I would give ten stars if could! I love these collapsible travel water bottle!!
Screw off cap and the bottles inflate on their own with Press the intake valve; replace cap and the silicone water bottle stand up on their own. Easy to roll back up for carrying/storage. Light weight. No odors.
I'm guessing the people who have experienced bottle not standing up when not completely full do not let the air refill into the bottle after taking a drink. That seems to balance it out perfectly. The drinking spout is like a "straw" shape/size with screen that will allow you to infuse water with fruit (or use ice) easily, as you please. If you squeeze the bottle when you take a drink, you should let the bottle refill with air to maintain the bottle shape (and not be like a toothpaste tube!) before you close the flip-top.
Consider these for traveling! You can carry small and lightweight then fill with water from fountains or taps or at restaurants. It's also nice to fill them when heading out (and not have to carry back larger empty bottles or create waste/expense buying water bottles.) It is always difficult when traveling to make sure that you have enough water and conveniently around. Refill and drink 3 times each day and you have almost your entire water intake need met for the day!
I am happy and hope that if you buy these silicone water bottle, you will be happy, too.

This is one great little water bottle! I used it on a 9-day adventure travel trip to North Africa and it was my personal source for purified water hydration 95% of the trip. Pros: DOES NOT LEAK! Very comfortable to carry hung from a belt while walking/hiking - feels like an extension of your body brushing against your leg; I was very thankful it has the clear plastic cover as it kept the mouthpiece clean and free of dust and debris (which there was a LOT of); said cover is very durable - no scratch or crack when I dropped the nearly full bottle on cement right on the cap! Stands upright even when below 50% full. Bright blue color is easy to spot among camp clutter. Wide mouth makes it a breeze to refill. I never noticed any chemical taste during use. CONS: a bit heavier than I wanted; not as compact when stored as I had hoped; bottle must be manually vented - easy, but an extra step - and this is required if you want it to stand upright as it empties out. The storage binder kept coming off when not in use - nearly lost it several times. Don't drop this bottle on dirty surfaces - everything clings to the silicon body until you can rinse it off.
All in all, I was very glad I purchased this bottle. I'll be bringing it with me on my next trip!