Why does my kitten bite his carrier

We got Squeak 2 days ago and he'd never been in a carrier before so he's been sleeping and hiding in it to ambush the toys, but he also keeps biting the sides. He's 8 weeks old tomorrow. Why?


Sorry if you cant see him but he's resting his head on his white paw while biting

It's very rare to have a kitten that doesn't bite, chew, and nibble on....EVERYTHING.  

My previous kitten didnt do it (but perhaps it was because he was a farm cat) but he doesnt nibble or chew anything except his carrier and his food.