I've spend months at a time, e.g. Sicilian island hopping, with less than this. For me the critical issue, which drives all clothing choices, is being able to independently do laundry. That is easier in frequent small batches; I can't imagine traveling with eight T-shirts!

After washing clothes, layer them in a large wringable synthetic pack towel, roll, and twist. Then they can be hung without dripping, and will dry in a fraction of the time. Wring out the towel and repeat. Or, if one has just arrived at a hotel with towels for four, get busy before they clear three of them in the morning.

One needs an ample supply of travel-scaled clothesline and clothespin equivalents. I last traveled with tiny Nite Ize Gear Ties, and a few larger ties with loops for securing the clothesline ends. Be thoughtful about attachment points; foreign construction quality can often be surprising.

I can't praise highly enough merino wool T-shirts, even in the hottest weather. I found mine on closeout; they can be expensive.

The Aranet4 CO2 meter is an interesting pandemic choice. I own one for monitoring my classroom assignments; they're very well made.