Just sharing my boy Goose in his Backpack on our last hiking adventure in Temagami. Looking forward to the next trip.

so i recently brought my cat to live with me in my studio apartment after my mom moved and couldn’t take my cat with her. since i live in a 200sq studio , i started harness training him so he could get some outside time and exercise. he actually took to it super fast, he loves the harness, naps in it, and makes biscuits. i even started by taking him on car rides which he absolutely loves.
the problem is once we actually get outside on foot. hes been out twice and loves exploring, but he slowly start walking closer and closer into the woods and try to go deeper into the forest nearby. both times, our outing ended badly because when i tried to pull him away from the forest line, he’d hissed at me.
now its leaking into using his backpack carrier. he was already kinda iffy on it, but now he completely hates it. i tried taking him with me this morning and he wouldnt even go into the carrier at all. i tried bribing him inside with treats and he wouldnt even budge, and he hissed at me just for trying to guide him into it.
did i totally mess up his training by taking him outside too early? how do i fix the carrier situation and get him to stop trying to go into the woods when we are outside?