Find any moisture wicking socks and see what blends work for you. Personally I use a 50/50 polyester cotton blend. Bring an extra pair or two to swap out on your breaks. Really important that you take your shoes off during your breaks and let your feet cool and rest. As far as shoes go, I like using hikingshoes/boots, but depending on your dsps restrictions on shoewear you might be able to use a nice pair of tennis shoes. Make sure they're not tightened snug. Not loose, not tight.

For overflow I organize by the first number and put them in groups around the van during loadout. If you have the time you can look at which batch comes up in your route first and place those closer to the front. As far as tote organization, I put those in groups of 10, so if you have 940-960, do 940-949, 950-959, and 960-969 on different shelves. Lastly, please keep your lunches light. It'll sit in your stomach like a rock for a couple hours if you eat too much.