Black Diamond Avalung II
These have gone up in price significantly in recent years, I bought mine before the price rise, so they are a real bargain.
Black Diamond Avalung II, increases your chances of being dug out alive.
Reports say that if buried in an avalanche you have about 15 minutes of air.
An Avalung II is reported to extend that air an extra 30 – 40 minutes.
When time is critical an Avalung is a good choice.