What does everyone usually bring for a bag? I'd like to have my Vita and 3DS on me, but don't really have the pockets for both. Do people typically wear backpacks around the convention hall or something a little lighter like a shoulder bag?
My personal opinion.. No do not use a shoulder/messenger bag for walking/waiting in the expo hall. Yeah unfortunatly a full backpack will be bigger , but its worth it!.
Your shoulder will be hurting just after the first day, esp if your picking up swag on top of your already planned additonal luggage.
Besides that.. also bring a water bottle.. there is long lines and food/bevarge vendors are usally on the other side of the hall.. so can easily take 10-15 mins to get to them from no matter where you are.