Optics in my opinion is the most important tool in your tool. You can't hunt what you haven't seen. I recommend all of the following in full confidence.
Most of the hunting we do consist of day hunts but I always hunt in a frame pack for the weight distribution and the ability to pack out without wasting a trip.
My first aid kit is personalized and stored in a small, dry bag.
I tend to hunt a more run-and-gun style. I like the ability to pack and unpack camp quickly. Keep it simple.
Keeping your body fueled is essential. Nothing is more mentally draining than feeling like you can't pursue your game because you feel tired and sluggish. That starts with what you are putting into your body.
There are a ton of companies making high-quality clothing. In my opinion, worry less about the name on the front and more about the materials listed on the tag. You want light moisture-wicking material that will keep you warm but won't rip on every tree you brush up against.
Depending on what type of hunt you are on if you don't take care of your feet they can't take you where you need to go. Your feet will thank you for a quality pair of sock and good insoles.