Backpack or Lunchbox?

Hi all! We’re a month away from day zero in the desert! I’m looking at buying a Lunchbox this year. I know it’s worth it, but previously I did a hiking backpack last year with padlocks on the zippers. It worked wonders, but was very cumbersome and also broke my charging cable due to my phone being yanked around during sets (not stolen). I was wondering if a lunchbox would put less strain on my back, but I know it has smaller space overall. Thoughts?