If you want some tips on how to pack for a world backpacking tour then you could do worse than follow the lead of young Daniel here.
From his understated Eberlestock Halftrack Backpack in black (tastefully decorated with it’s T.A.D. Gear Terminator Skull Patch), right down to his Groom Mate Platnum XL Nose Hair Trimmer, this is a guy who knows how to pack for every eventuality, yet still keep it minimal.
When I went travelling the killer essential was the felt like travel towel which, unlike regular towels, wraps up to a ridiculously small size.