My backpack is constantly filling up. This requires me to turn items into scrap that I wanted to save or even throw items away. I researched online and found that there is a Team Fortress 2 item called the backpack expander which increases the capacity of your backpack. That is great, but I cannot find out where to get it except for the Mann Co. Store. I would rather not pay for it, but whenever I join a trade server or pub I cannot find anyone who has it.
Does anyone know how to craft this item? I'm afraid the answer might be that it is un-craftable. If that is the case, does anyone have a good strategy on how to join a trade server that is likely to have the item you are looking for?
Open to other suggestions as well for locating and obtaining specific items.