Being in a new relationship is exciting, nerve-wracking, and thrilling all at once. Every "first" is more special than the last, even if it's something as small as your first time calling each other "babe" or as magical as your first kiss. As you get more comfortable with each other and start spending more and more time with each other, you'll eventually get to the point of spending the night at each other's places. But for the sake of not scaring them away or intimidating them, you'll need the best packing list for visiting your boyfriend or girlfriend, so it doesn't look like you're moving in.
Your overnight bag should strike just the right balance of essentials so that you don't go overboard, but you should also have enough stuff to be really comfortable spending the night with your boo. Make sure that your bag isn't filled with too many things that you don't need, but also make sure that you pack everything that you actually do need. (You don't be the girl who forgets to bring a toothbrush!)
At the end of the day, though, try not to worry about your overnight bag too much. Enjoy every moment you get to spend with your new boo, and remember each "first" as it comes. They only get more special as your relationship grows.