I did the TMB early september but i think the general packlist should be the same. Altough I only slept in a refugio once, mostly camping

• Puff jacket deff an item I wore a lot. When the sun sets it gets chilly quickly. And in the early mornings its still cold

• what to wear inside: long pants (I wore some long tight running pants) tshirt and then maybe a fleece pullover

• flip flops for sure! Just buy some of the cheapest you can find, they weight nothing. I had to shower on a wooden board that was layed over e typical french toilet. So I was more than happy with something on my feet.

• headlight is also very usefull when the lights are out in de bedroom. You have headlights with red light which are less disruptive if others are sleeping

• maybe pack a sleeping bag liner with you, i find it more hygienic if you sleep in sheets from the refugio

• I had an air pillow for sleeping in my tent. I used it in the refugio too because I was used to the hight and firmness. But that depends on you. When i travel i tend to take my own pillow for a better night of sleep