NFL has a league-wide clear bag policy. You can read more about it on the official NFL website here.
From that page:
The NFL strongly encourages fans to not bring any type of bags, but outlined today what is permissible. Beginning with preseason games, fans will be able to carry the following style and size bag, package, or container at stadium plaza areas, stadium gates, or when approaching queue lines of fans awaiting entry into the stadium:
- Bags that are clear plastic, vinyl or PVC and do not exceed 12″ x 6″ x 12.” (Official NFL team logo clear plastic tote bags will be available through club merchandise outlets or at nflshop.com/allclear), or
- One-gallon clear plastic freezer bag (Ziploc bag or similar).
- Small clutch bags, approximately the size of a hand, with or without a handle or strap can be taken into the stadium with one of the clear plastic bags.
- An exception will be made for medically necessary items after proper inspection at a gate designated for this purpose.
Prohibited items include, but are not limited to: purses larger than a clutch bag, coolers, briefcases, backpacks, fanny packs, cinch bags, non-approved seat cushions*, luggage of any kind, computer bags and camera bags or any bag larger than the permissible size.