So still mostly on Pandora? One quick tip: fast travel to vehicle. Eg. Droughts - drive as close as you can get to your target, commit mayhem, fast travel to the Raiders outpost and use either the machines up the stairs or the one in Marcus’ compound that you presumably fixed earlier, then FT to your vehicle. The most valuable loot you left behind should still be there (junk disappears first, then white, green, etc.)
If you’ve already made it through to Sanctuary, you also have the Lost Loot Machine that can pick up blue and higher rarity items left behind when you FT to a different map. HOWEVER this only works if you are in cooperation mode. Note that if it’s full, new higher rarity items should displace lower rarity ones.
As mentioned up thread, Gearbox did add vending machines on a number of maps compared to the launch version. Mostly, you just need to get more used to the ‘FT from anywhere’ and ‘FT to vehicle’ modes.
If after that you identify a specific map and location where a vending machine would be really useful, feel free to make that suggestion in this thread.