So far the one gear thing I wish that I would have done differently is that I made a Jerry chair out of a 3' x 6' piece of Tyvek. I wish I would have put grommets in the four corners and brought extra shock cord to use it as a weathershirld for my underquilt. I use it as a pack liner during the day. I haven't "needed" the uq cover but it would have made me more comfortable on one or two stormy nights.
Beginning my NOBO trip on the AT on 2/28/12.