One thing about superhero costumes is that they don’t have many pockets for carrying your items. That’s why Steve Rogers uses this Captain America Costume Messenger Bag.
It matches his outfit so he can take it with him and carry all of his stuff, while still looking awesome. It measures 15” wide by 11.5” high. It has a large place for things and a smaller pocket inside of that one that closes from a zipper.
Also the inside is coated in vintage images of Captain America himself. This bag looks amazing. $48.99 from Superherostuff.com.