It can definitely be a pain when things get buggy. Next time, drop your existing backpack on the floor first then pick up the new one and loot your gear off of the old one. Whenever you swap for something, always drop what you have first. If you use the mouse wheel suggestion, exchange X for X, the first item will disappear into thin air.
PS. Ironic that I wrote this yesterday as I had a Bizon poof from my pack last night...
Edited by SFViper19D (06/30/12 09:57 AM)
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