All,
Yeh purge bottles before or as you go to altitude. If you left the tops loose most things would be ok but then they might tip and spill, but as one who often went from sealevel to 10,000' in a day, your toothpaste, sunlotion, alcohol bottle, canteen, etc can "explode" either in your pack or when you open it. Might want to tap a bottle down on a rock a couple times so the gas bubble is in the top above the liquids, then scrack the top and hopefully let off the pressure without incident.

Anyway DEET is horrible but it works. I carry a bottle of 100% DEET in liquid form but I wait to see if theres mosquitos before I'll pull it out.

My dog likes to sleep under an old bath towel as shes part greyhoound and short haired. I'm going to sew a piece of no-see-um cloth onto the side of a towel for her.
Jim