|Comes in other colors too!|
They're very reasonably priced and have the capacity to carry about 500 milliliters (or half a liter) of water ... or any other liquid of your choice. The company website says that the collapsible bottle is perfectly capable of handling hot liquids, but this may be uncomfortable to hold without getting a sleeve for your bottle, so it's suggested that you stick to cool or warm liquids.
You can also freeze the bottle to create ice cold drinks without worrying it'll crack or damage the plastic.
What I also like about Vapur collapsible bottles is that when I'm done drinking its contents I can simply fold it up into a more compact size that fits nicely in my purse or bag. Plus, it's so light! Adds absolutely no noticeable weight when it's empty inside my bag. And I've been using this bottle consistently for a couple weeks now without having experienced any leaking.
If you're looking for a light, reasonably priced, collapsible bottle to carry liquids around with you, I would highly recommend Vapur collapsible bottles.