Backpacks at nikon at jones beach?

I'm going to see the Drake concert later on today at Nikon at Jones beach but I'm coming from really far away by way of public transportation. I would like to get there a little early to enjoy the beach but I would need just a small backpack to do so. Does anybody who has been there within the past year know if security will deny me access with my bag if I go to the concert after I've been to the beach

You can contact them at http://www.jonesbeach.com
and click onto the word "Contact".