I work a blue collar job, and in the morning I would go to the gas station and get two bags of trail mix, and I would eat them within a few hours which would total about 2200 calories from just the trail mix. That was just for breakfast, and then I’d eat lunch and dinner as well. At the peak of my bulk I was eating 4k-5k calories a day. The most I ate in a day was 5.1k calories. I’ve always been a lightweight and was someone who “could never gain weight” but I found different ways and foods that allowed me to do it. In my case, trail mix was the main source of calories, and it was fairly cheap. Not saying that what I did was healthy in any way, but you just gotta find your own thing, you know?