I note three people in your avatar... are you planning to carry the cookware for all? (Please tell us you don't want 3 pots for yourself, one to cook, one to eat, one to drink!)
If you're thinking for three people, and the third is your kid, then I would suggest that you probably don't need a 3rd for the kid. Doesn't look old enough to eat much volume, could feed from your bigger pot. Alternatively, mom can carry her 5-oz pot and you can carry a smaller mug for junior, ie a 450ml-ish, along with your bigger one... or mom can carry the small mug, you carry the two bigger, whatever.
I'm betting you're not able to nest 3 pots varying 600-1000ml in this configuration. That said, the Evernew 0.6L, 0.9L & 1.3L UL Ti (short) pots do all stack nicely...