bind-key -T copy-mode-vi v send-keys -X begin-selection bind -T copy-mode-vi y send-keys -X copy-pipe 'xclip -in -selection clipboard'
1) enter copy mode using Control+b [
2) navigate to beginning of text, you want to select and hit Space
3) move around using arrow keys to select region
4) when you reach end of region simply hit Enter to copy the region
5) now Control+b ] will paste the selection