My friend had the same issue. We believed it was because we had 4+ packs inside packs. Eventually after doing nothing but trying endlessly to unload my pack the server rest and when I was able to log back in I was without a pack (and it was not on the ground) but I had all my equipped gear and was now able to interact with items. Somehow we think the game was not able to recognize or identify all the bags we had that were all stacked into one another. Inside those bags we also had filled every space we could of 4 area clothing or containers with 6 slot capabilities.

I tried to get my character erased and changed my name on Steam to see fi that would work, but my character did not wipe and I still have it and all its gear when I log in.