what do you think about a 55L backpack for 5 days?

Hi friends.
It is my first time that I go wild with a group of other backpackers.
We will stay 5 days in the jungle and mountains and then we will return to city.
I usually go to one day hiking but this time I am going to have a multiday hike.

I am planning to buy:
One Polar 55L backpack http://www.donkeyhouse.net/inc/sdetail/223 , 75$
Or
Salewa 60+10 http://www.salewa.com/uk/4/257/4644-SIKKIM_II_60_10_BACKPACK.html?&limit=2 around 13$

My sleeping bag is about 1.7 KG and I do not know what other things I should carry.

Can you please help me with selecting one of these two backpacks?

Thanks.

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