For travel involving carrying sleeping bags or tents, a 65L backpack is unavoidable. This seems to be the most popular backpack among the traveling community Minaal Carry-on bag - 300$ for 35L Soot Electropack - 280$ for 24+10L, a daypack can be pulled out of the bag - website dead as of Nov 2018 Chrome Excursion - 160$ Venturesafe anti-theft backpack - 200$ for 45L. I read several blogs while choosing a backpack and no one recommended a really simple trick for getting an inexpensive high-quality backpack.