I don't know much about the best day at Costco, but I will say that Mondays have always been a busier day when working at grocery stores. I'm kinda sad they changed the RXBar multipack. I liked the peanut butter ones better than Blueberry. And I love the Costco Hemp hearts. I just wish the bag wasn't so big; it's just annoying to store in the fridge lol. I'm definitely someone who needs a bit of structure around my food. Even something as simple as the way I fill my lunchbox makes a HUGE difference. I don't feel restricted by the fact that I always have a vegetable, a fruit, and a sandwich for lunch. I give myself enough variety to avoid being bored, and I find that the structure actually makes things EASIER. Even on days I don't want to pack a lunch, the task is made easier because it's structured and mindless.