It's all a matter of technique

First of all you scrabble your front legs about in the bag opening. Once you've made a hole you scrabble them a bit more until you get yourself most of the way in. Then, this is the best bit, you pull your back legs up to your front legs then KICK backwards with a quick flip until the hay flies out behind you in a storm, then you do it again and again and again. Simple. There you are,deep inside the sweet smelling hay bag and nobody has the faintest idea where you've disappeared to. Magic. Then you grab what you came for because the sweetest bit of hay is always at the bottom of the bag. Out you come with a flourish, nibble it until it's gone then back you go again right to the bottom.
Once you're in there you can't hear a thing. There's bound to be somebody saying, just look at the mess that rabbit's making! Won't he ever grow up?