Yay LN! I didn't pack a hos bag for my HBs but that was mostly coz I was just being lazy lol and I figured the only reason I'd transfer to hospital would be for a real emergency so I wouldnt be likely to need any 'creature comforts', at least not until I was coherent enough to write a list for dh or other family member to get for me.
The things everyone else already said are good, I found lemonade essential for around transition when I suddenly get very thirsty (& don't want water) and nauseated. It's good for both and to rinse after vomiting if you do that like me. A bucket is handy also for if you decide to not birth in the pool. I love labouring in water but found I've needed to be on 'solid ground' for 2nd & 3rd stage, apparently its very common so just wanted to put it out there for you to keep in mind itms.
Maybe a handheld mirror if you think you'll possibly want to see progress.
Perhaps some sanitary pads that have been moistened a little and frozen for post partem (with the HUGE hospital pads you can kinda break open one end and slip them inside) feels lovely and soothing when sore 'down there', witch hazel is meant to be good for that too but I haven't needed anything since ds1 so someone else is probably better to give advice in this area.
Umm can't think of anything else right now...