Can you take Lenny with you, or does he have to stay behind? I ask because I have had a few weekend health scares with my rabbits, and had I not been there, I wouldn’t have seen them hunched in a corner, not eating (there is the whole 12-24 hr window where things can go downhill if the rabbit doesn’t eat or poop or drink). Having him a smaller cage for the weekend, and with you is probably better than him being alone, especially since you visit your b/f on a regular basis. That’s one suggestion, other than finding a neighbour, etc for bunny sitting.
I have a handmade fabric haybag, and I love it. It’s lightweight, minimal mess, and holds a lot. I use it for 2 rabbits, and so far, it’s held up.
I order first cut timothy hay online from a farm in my state. I have ordered from another company, but that one had way more dust. I shake it out before I fill up the haybag, and that seems to work. I wouldn’t buy store bought hay nowadays. Plus, my rabbits like a coarser, greener hay, and I like that I can buy a bigger quantity.