Hey man... you will have no worries at all on holiday with your piece! Just use either ST30 or Ultrahold for the sides and back, and you will easily get 16 days (ST30) or a week (Ultrahold).

One thing to remember, is that strangely for the first 3 or 4 days the ST30 feels "fairly" secure. But on the 4th or 5th day, after lots of water and heat, and a shower, it actually started to feel much more secure and tighter on my head. Strange eh :o