I keep a Trello board where I list things I own in my life. I mark items that I no longer need with Sell tag as well as items I need to upgrade with Upgrade. I try to make sure that the items I do own fit into one backpack so I can move to any place in the world with no effort.

Here is how that board looks for me:

I attach the prices of the items I buy inbetween the brackets (in USD). And I describe how I use each of them & the link where I bought the item from in the description.