Hop in the shower and give that scalp a good wash. Remember to have a second shirt lying around somewhere for when you get out of the shower. Putting on a shirt coated in tiny hair clippings doesn't really sound like fun.
Nothing left to do but admire the weight of hair in the bag as you tie it up and walk it to the curb. You may feel the urge to store the hair under your bed, but chances are you'll find it a year later and there will be a colony of maggots living in it. Trust me.