This 5 ounce collapsible cup is made out of solid stainless steel so you  know that it is rugged.  The attached key ring is not necessarily for use with keys but offers a nice way to secure the cup to a strap or cord.  It's safer just to drop it into your kit, purse or glove box.

Just extend the cup and fill with your favorite beverage.  It will not leak in the fully extended more.

These are handy to have around and they take up very little space.

Items made from stainless steel should always be included in your emergency preparedness supplies.