Based on the reading below, answer questions 44 and 45:

TIPS FOR CHOOSING A BACKPACK

Picking the right backpack is an important part of any trip. Too big and you’ll have too much extra weight. Too small and you’ll never fit anything in. The wrong material and, when it rains, your stuff is soaked. A good backpack is an investment in something that will last you many years of multiple trips. I still have the same bag I bought 6 years ago.

http://www.nomadicmatt.com/travel-tips/

September, 2012.

According to the text, the right backpack is:

I. Big enough.

II. Really large so you can carry lots of things and get it heavy.

III. Made of rainproof materials.

IV. It is an investment that lasts more than 6 years.