Not upgrades really, but wearing leggings with pockets is so great bc I can put my phone and airpods in them along with boarding pass and/or passport. I don’t have to dig in my bag and I know they’re securely on me.
I also bought an airplane blanket that has its own little holder bag that can be used as a pillow - it hooks to my backpack and there’s enough extra space that I stick my snacks, water bottle, whatever else in there that I’ll need at my seat. So I can put all that in prior to boarding and then I can just throw my backpack into the overhead bin and keep the blanket pack thing at my seat