Don't worry about the extra layers, I read on the Enchanted Circle you can drop them off at one of the rest stops! I am sure they have an organized way of tagging them. Oh and everyone is right, don't let the jitters get you too wound up. Before our first MS150 (probably the most nervous I have ever been) I hardly slept. I paid for it by being sick the following Tuesday. I slept 16 hours.