1) A very large purse, often covered in emo band paraphernalia.
2) Device used by a band geek to carry possessions, such as CD players and rather stupid things that shouldn't be at school in the first place.
Non-Band Geek: Can I hang out with you?
Band Geek: NO! You're not in band! We all have low self-esteem and are not very attractive, so we must exclude everyone to feel important and hot. So sorry...We rule, by the way. 'Cause we're in band. Yeah.