The travel backpack is a good compromise to go with you on your adventures. In fact, it's just as practical as a suitcase and as comfortable as a backpack. It is accessorised and secure making it ideal for travelling.
You could also choose a duffle-type carry bag that is flexible, durable and transportable on all means of transport.
However, a duffle bag will prove to be less comfortable to carry longer term than a travel or trekking backpack. It’s useful for carrying your hiking equipment on short walking stages during your trip.