Sexier way to write this code?

How can I write the following code better stronger and sexier? To me it feels icky using the eval function.


var bagData = {
	"beach" : {
		"ratio" : [4,3]
	},
	"bucket" : {
		"ratio" : [5, 3]
	}
};
bagType = "bucket";
ratio = eval("bagData." + bagType + ".ratio");