a bottle 

A company named BevyTech LLC is offering a new sports water bottle named Gadget Bottle, described as a "handy travel, gym and bicycling accessory". The product is basically a water bottle with four synthetic bands that can hold many different items, such as your phone, your mp3 player or even your digital camera, while you exercise. Needless to say, you have to be cautious because of the liquid.

The bottle holds 22 ounces (or ~ 650 ml) of your choice of beverage, and retails for around 8 bucks (plus shipping) on the company's site. The site also goes on to mention possible (but highly unlikely) scenarios in which you couldn't survive without the bottle, such as: "are you staying at a hotel or resort that uses a credit card style key?  Where do you keep the key when you go to the pool, exercise room or tennis court?" and for some reason it's also said to make a "great office gift", although people exercise outside and drink coffee out of cups at work.

Bottom line: if you have some extra cash and are too lazy to put some rubber-bands over a bottle you have lying around at home, you can get this, but I seriously recommend you don't.