What to take on a five month trip

I was asked by many people what I would be taking with me on my travels. For myself these are my essentials:
1) t-shirt
2) shorts
3) bikini
4) Prada sunglasses (authentic of course)
6) simple medical kit
7) flip flops
8) Immodium, wet wipes, hand santiser, more wet wipes, baby wipes, more immodium, did I mention wet wipes already?

So I arrive at the airport and my bag only weighs 8kg! So the question I ask myself is "what have I NOT packed"?

With hardly any clothes and enough wet wipes and antibacterial stuff to last a year (in the uk that is) I run to Boots and buy even more tissues and wet wipes. I figure if I get ill at least I went down fighting!