Left behind gear

So I was packing a big suitcase last night and had to keep it under 50 lbs.  I was at 57. I got ruthless. Shaved off 10 lbs. what is unnecessary?  What can I abandon?  

I have already abandons almost all the kitting I bought for traveling across the USA, a trip I was planning for Feb. 2015. I just couldn't justify the bulk or expense of getting it all overseas. I will replace the camping gear in Scotland. I still need to get the Ortlieb front panniers and also the Ortlieb rack pack. 

Now to get the bike put back together when I arrive in Scotland. If I only get on the rear rack I will be happy.