Every adventure/outdoor athlete should have at least a few of these. Put them in you car, in you backpack, in you ski jacket pocket, in you toolbox, in your mountain bike kit, etc... They not only make great ski straps for traveling or holding together your A-Frame on you ski pack, they have about 1,000 other uses.
For example, when the front tire ratchet strap on my roof-mount bike rack broke I simply cinched it down with one of these and didn't think twice about hitting the interstate home.
One of the most amazing characteristics of these little straps is that no matter how cold it gets (at least to about -20 in my experience), the rubber stays pliable and flexible.
Buy some, you need 'em!