(1) whistle is what we'll use for an emergency assistance such as lost Woods was an accident until the walk is not etc. There are many many types of whistles. (2) plastic bags to pack the luggage and clothes if it was wet, and will cause damage to it, regardless of whether it is surfing the trekking season. It is also possible to use other useful again, such as artificial lighting is used to prevent the wind blows to extinguish a candle flame to shine brighter, or use packaged water from Lam to the camp and that there are no water sources are at, etc.
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