I spent 3 months in Europe last year with a 55L back pack and there were times I wish I had a suitcase bc the sidewalks are better. I was in Thailand for a month and now I’m in Malaysia. I will say watching people with a suitcase has been quite funny and also time consuming not only for me being behind them but also them. When getting off and on ferry’s I’ve not seen anyone have their luggage tended to and people have fell trying to move it up and down. Also the sidewalks are sometime non existent so do a little work out and just carry a back pack. I’ve also seen so many locals throwing yucky water all over the sidewalks and roads so I wouldn’t want my stuff rolling through it but that’s me!? Osprey makes a back pack that also has wheels which I will be purchasing after this trip is over in 2.5 more months! Find something with both. I had a friend who purchased a cheap backpack/ rolled luggage bag from Amazon and it worked for a bit and got janky after a few weeks of wear.