It's great that you're prioritizing essentials for the initial weeks and planning ahead. Many new parents underestimate the amount of preparation needed during the early stages, so kudos to you for being well-organized!
On that note, another useful item to consider is a portable changing pad. Those built-in changing tables at public restrooms can be quite grim (and smelly too!), so having your own padded, waterproof changing station comes in handy. You don't want to be stuck without one when you need a quick and sane diaper change on the go! They're compact enough for your hospital bag and easy to wipe clean afterward.
Other than that, it might be wise to have some baby soap or shampoo samples, cotton balls, and even a tiny towel, all kept in your hospital bag, just for the little one's first bath. It's quite the production with all the tiny details, but very exciting too!