Down jacket
Rent it. We earn nothing telling you this.
A good down jacket costs $300-400 to buy and about $1 a day to rent in Thamel — a rate trekkers have reported consistently for over a decade. You use it for one trek. The maths is not close.
If you do buy locally, the risk is not the logo — it is fill. Counterfeit "down" is often feathers or foam, which looks convincing and is thermally useless. Squeeze it: real down springs back in seconds. Shona's and Sports Wear International are the two makers trekkers name repeatedly as genuine.
Rent this in Nepal. About $1-2 per day in Thamel or Pokhara. We earn nothing when you do.