This practical water bottle design from Contigo is called the 'Kangaroo' for a reason — it has a clever pouch where items can be safely kept. This water bottle is ideal for those who like to head to the gym or a yoga class, but are constantly worried about losing or having their valuables stolen.
The small pocket built into the Kangaroo water bottle provides just enough space to store keys, money or credit cards so that you can keep an eye on them. Since you'll be wanting to keep yourself hydrated, it's less likely that you'll forget this item.
The flap that closes the small pouch is opaque, so no one will be the wiser that you have precious items stored inside. Because it's so inconspicuous, it's less likely that someone will want to steal your water bottle, unless they're really dying of thirst.