I carried the backpack yesterday, we had 1L of water (didn't use it because we just grabbed a pitcher inside when we went to eat). I packed 4 sandwiches in there for the whole family, wrapped in foil and then put in ziplock bags. They didn't get too squished, tasted great. We all had separate sandwiches which held up well, cranberry sauce (DD just loves it, lol), PB&J, dressing and cranberry sauce and turkey with lettuce. We will definitely have room to pack a little more next time if we need because the lodges are just so expensive, since it was our first day skiing I treated the kids to 2 chocolate chip cookies and chocolate milk and it came out to be just over $15, ugh!
Otherwise, additional thoughts were for us to pack hot chocolate in a thermos in the car for when we get back to the car at the end of the day.
We went skiing at Snowmass, ate indoors at Elk Camp, they have a pretty great system in place, you get entry tickets to get into the dining room, one way traffic to go through the "grab and go" section, order hot food at the checkout and they give you a buzzer to get it when it's ready. Tables are spaced far apart. Even though it is still early season I felt that their protocols might hold up with slightly higher numbers of people on the mountain, but with some longer wait times. They definitely thought about it and I felt safe today, we'll see what it looks like later in the season...