[Long Term Travel] What are you bringing to store your things?

I've been traveling for almost 2 months now and I'm just now realizing that I don't need to bring everything. <br><br>So, I'm curious what are you using to store your things? <br><br>1. Backpack (you'll need to carry everything on your back) <br>2. Duffel bag (you'll have to hold it in your hand at the airport) <br>3. Suitcase (you can fit everything inside and can be checked at the airline) <br>4. Storage unit <br>5. Rucksack <br><br>I'm a fan of the suitcase. It's a 30" one and it can fit almost anything. The only issue is that when it's packed to the maximum, it becomes very heavy to carry. <br><br>I'm curious to hear about what you use to carry all your stuff.