Everything should be multi purpose - this means don't pack sleeping shorts that can't be worn for walking, or nighties that can't double up as a shirt. Ladies - black lycra pants and bra tops can double as swim wear. Choose the lightest shorts you can buy. Running shorts from a sports shop are good. Jeep make lightweight shorts that can fold up into their back pocket. Find lightweight, wicking t-shirts and if this means taking your scale into a store when buying stuff, so be it. If your t-shirts are unnecessarily long, cut them shorter. This will reduce their weight even further. Cut the labels off your clothes - I'm serious - they will only irritate you anyway. An ultra-light fleece pullover can double up as a jacket if you convert it by putting a plastic zip into it. I use a black rainsuit rather than a poncho. The trousers can be used as over trousers in the mornings if it is cold and in the evenings when I go out. The jacket can also be worn when it is cold. Parachute jackets - the ones runners wear - are an excellent chill cheater and fold up into a little ball. You can also have parachute 'sweat' trousers made of the same lightweight material - mine weigh 95gr - 3.35oz.
Take a pair of lightweight sandals - Crocs are excellent - to wear in the shower and when relaxing in the refuge. I wear socks with my Nile Crocs and can wear them all day and they only weigh 210gr - 7.5oz.
Take a minimum of toiletries. You are going to a first world country where there are more farmacias than bars - so, take a sample bottle of shampoo, a tiny bar of soap, the smallest toothpaste you can find. You can replace everything and anything when it starts to run out.
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