Packing for florida in 1 week?

So I am going to a florida showcase (for field hockey) and I need to pack lightly because I can only bring what fits in my backpack (including my laptop and books) Im going for 6 days and playing field hockey for 4. I am bringing 3-4 workout shirts and shorts and my field hockey stuff but what else should I bring that could fit in a backpack (northface) THANK YOUUUU!