Outdoor folding bag, originated from the invention of the climbers. Climbers at the final camp, need to be at the top no longer carry large backpacks heavy and clumsy, so with such a package, his demands are:

I. ultra light, reduce the maximum package weight

 

II. collapsible storage when folded is very small in size, process can be placed in the large hiking bags up the mountain, convenient to carry.

 

III. 25 litre capacity can put a certain amount of beverage, warm clothing, life preservers.

 

IV., fabric is strong and tear resistant.

 

V. shoulders can carry completely hands free     v. to bright colors stand out

 

-----So this type is also called top package