I'm going to be travelling through Central and South America for 12 months or more. I'm wondering whether to take my 100L Linehaul trolley bag AND an 80L backpack for treks and excursions. Do you think I can leave the back pack behind and get away with just having the trolley bag and wheeling it around everywhere?
Less is more. Over the years I have learned to rely on just one pack that can be easily schlepped whether from airport to hotel or for hours while hiking. It is a lot easier to navigate crowded streets/buses/trains and peace of mind not having to worry about "stuff" that most likely you'll find you'll never need anyway. Yes, many hostels have left luggage if you go away on side trips and return, but that too can be restricting and can dampen spontaneity if you have to always go back somewhere to pick up bags.
Safer too, being encumbered can make you vulnerable or targeted. You may well be taking a lot of buses and what you can't fit in the tiny overhead space ( if there is one) will be taken off your hands & strapped to the roof or cargo hold. If not being able to keep an eye makes you nervous, then stick with one bag that's easier to manage and keep on your person.
Pack less, do laundry along the way ( lots of lavanderias peppered in many places & it helps the local economy), buy the odd clothing along the way if you need it and enjoy the freedom that comes with traveling light! about 8 years ago