Xrunner
Explorer
The 37qt would be great for one person, 50qt great for 2 people, and the 63qt good for enough food for 3+ ppl for a week. I have the 50qt and I mostly travel by myself. I find that with the 50qt if I am doing a solo trip I need to fill empty space in the fridge with drinks.
This. I have have the ARB 37qt and it's a little small to comfortably fit food and drinks for 2 people for 2+ days... although it's great for overnight trips with 2-3 people. To make it work I take a small Coleman with extra drinks and rotate them into the 37 qt as needed, usually 9 or so at a time.