1) Because they are a cheap and easy way to see a country.

2) They often travel by train, by coach or on foot.

3) They can share some items: a tent, a gas stove and food.

4) They should remember that the rucksack will be heavier if the weather is wet.

5) Yes, we can.

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$\begin{array}{I}\text{1.Because they are a cheap and easy way to see a country.}\\\text{2.They often travel by train,by coach or on foot.}\\\text{3.They can share some items: a tent,a gas stove and food.}\\\text{4.The should remember if the weather is wer,their rucksacks are heavier.}\\\text{5.Yes,we can.}\end{array}$