Where/how do you find is the best way to store your next action and waiting for support materials? Another inbox? A file folder? Sometimes more than just paper, maybe a book or compact flash cards from camera with images to process, or technology item that needs to be installed...all these would be on your waiting for or next action list, but where do you put the physical stuff so that when you are ready to work you can find your support materials?
I have lots of things that don't fit into normal office files or folders that are project support material. I have locations in each major context area for that stuff.
So for example, when we used them the marking harness for the ram and the crayon for it were put in the box in the ewe barn. The next action was put rams in for breeding with a marker. The skeins of yarn for the rug I want to weave is in a tote in the shop where the loom is. The next action is design the warp for the pattern rug from handspun. The ear tags, EID reader, label printer, wifi hot spot hardware, needles, syringes, blood collection tubes and LambTracker tablet are in a box by the door on the way out to the corrals. The next action is replace missing tags and take blood samples for DNA testing from yearlings. (I can't leave the hardware out in the cold so that's why it's in the house by the door.)
Some things I have to leave in a specific place in which case my next action references it. For example, the next action "Give Thane his series of custom vaccine shots" has a note attached "vaccine in main refrigerator, use insulin syringe in sheep medicine cabinet".
Books are in a designated section and I have limited space. I don't buy more physical books than will fit in that space to read. I also try not to buy too much from my kindle wish list until I've finished a bunch I already have on my device. The new hard drives for the server upgrade are living in a box beside my inbox right now because it's a waiting for some time to do an orderly shutdown, pull old drives and replace them and restart the automatic backups. That's not ideal but does work. I have a large L shaped desk so I can designate a section of it for that sort of project material. A solution I used in the past was designate a shelf for that sort of office project support material and put them all there. Either works it's what fits in your environment.