I say unfortunately for the following reasons:

1) These packs do not get cold enough to have any impact on an injury. They do not stay cold long enough to allow any cold to penetrate to the lower tissues. In other words they are only a placebo, and have no impact on the injury itself.

2) They are dangerous! The chemicals are very active. Should the bag break, which happens often, and you get the substance on your skin, it can cause a nasty burn. In Wisconsin one of these packs was responsible for blinding a player when the bag leaked and the chemicals dripped into his eye.

3) They are expensive. At $1.25 each they are the most expensive cold application in the market.

They are convenient and easy to carry. But you might as well carry nothing for the impact they will have (and nothing is even more convenient). And if you have an injury, do you want to be relying on something that not only won't work, but might actually cause more damage than the injury itself?

Forget the chemical cold packs. You'll be far better off for it. Use REAL ICE instead and your players will be healthier. It's all the pros ever use.