If you have bites that you can't identify, you should assume that they could be bedbug bites and takes steps to eliminate any traces from your gear. Put everything that can go into a hot dryer on high temp (60 degrees C) for half an hour. You don't need to wash the clothes first. What I did last year when I had suspicious bites was to take everything washable to a self service laundry. All of my clean clothes went into the hot dryer for half an hour. I then changed into those clothes, and washed what I was wearing, and everything else that needed to be laundered. You don't need to wash on hot, but everything needs to go into a HOT dryer for at least 30 minutes. All of my clothing and sleeping gear were able to handle the high heat, including my silk sleep sack, down blanket and merino wool sweater and other clothing.
If the weather is hot enough, put your backpack and everything else into a black plastic garbage can liner, seal it up, and put it in the hot sun for several hours. You are trying to get the contents to at least 50 C for half an hour. If it's not warm enough for this step you can put everything into the bag and spray it with DEET insecticide and leave it as long as possible.
More info:
https://www.bedbugs.umn.edu/bed-bug-control-in-residences/laundering