There is a Changing and Storage that is intended for 405th Members who are volunteering at the event to be able to get in and out of gear depending on what their next volunteer shift is, like changing between doing a photo op shift to suiting down for a Panel Presentation or Information Table shift. If you have volunteered for a shift working the booth or another associated activity you may store your bin there.
If you have not volunteered to assist during HOD, then unfortunately there is no secure place for you to store a tote. There is a "Cosplay Lounge" but it is not secured and is open to the public, so you will have to leave your tote at your car/hotel room..