Pre school Lunches

My son just started private pre school a couple weeks ago, I am so so lost on how to pack his lunches. It’s not about what to pack, I am completely lost on how to pack it. The first week, I was putting everything in ziplock baggies, the second week I started putting some food in a ziplock & some in small food inTupperware containers & some in ziplocks to eliminate the plastic. I was looking into bento box type lunch boxes. I really am all for less plastic, but I also don’t know if that’s just more of a hassle for the teachers? I’m really not sure. I had 1 pre school teacher tell me she prefers everything in a ziplock, that it makes her job easier. So ever since then, I stopped looking to buying a LunchBot or a Bento Kids lunch box. I’m really lost and just want to do what’s best for my kid & what’s easiest for the teachers.