I’ve been traveling per sessions of 3 months many years, and now I can fit everything in a 30 liters backpack for a multi-month session. Here is my essentials, pretty basic:
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earplugs and eye cover, to be able to sleep in hard condition (very often). Also, an inflatable pillow depending of your clothes
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wireless AirPods or jack AirPods.
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a multi-usb charger + slim country converter + car converter (when renting)
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a small SD card box with an sd card and mini tools to extract your sim
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another, small form factor phone (to relay wifi with another sim in it)
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an external battery
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1 small notebook + pen
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my computer + 2 dongles + my phone
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1 long iPhone cable + 1 short multi usb/iphone output
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1 trashbag
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packing cubes
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3 good underwears that don’t smell easily, 3 pairs of socks in a fabric that don’t smell easily
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baby wipes for quick cleaning when most needed
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1 small anti-odor spray for fabric (yes, managing how many clothes you’re going to take with you is key for lightweight)
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1 detergent for clothes