How cool is this?

Can you tell I have a craving for homemade ice cream? I thought this was a pretty neat idea!
I found this recipe at organicvalley.coop

Plastic Bag Ice Cream
PREP TIME
10 Minutes
TOTAL TIME
20 Minutes
SERVINGS
1

Ice Cream
1⁄2 cup Organic Valley Half and Half
2 tablespoons sugar
1⁄2 teaspoon vanilla extract
Supplies
2 one-quart sealable plastic freezer bags
1 one-gallon sealable plastic freezer bag
4 cups crushed ice
1⁄2 cup rock salt
Gloves or a towel
1. Place half & half, sugar and vanilla in a one-quart plastic bag. Squeeze out excess air and seal tightly. Shake vigorously to ensure sugar is completely dissolved. Double-bag the first bag with a second one.

2. Place these bags inside a gallon-size bag. Add crushed ice and rock salt to the outer gallon-size bag. Squeeze out excess air and seal tightly. Place the bag inside a towel or put on gloves. Shake and massage the bag to work the ice around the ice cream mixture. When mixture firms up (in about 5-10 minutes), remove the quart bag from salt and ice. Serve immediately.