180ml is fine. That's the size of jars marketed at that age anyway (though I'd be a bit sceptical about accepting what the baby food industry try to sell us as "ideal"), and very easy to get up to this amount if they are having a "main" and a "pudding" (I like to keep DS2 having regular fruit so he doesn't get constipated). Snacks as well would easily push this over. Babies vary enormously in their appetites at this age. Some are still eating a couple of teaspoons or bites, others will eat almost an adult portion e.g. for breakfast. As long as you are following their lead I think it's OK to give them as much as they want. Just be aware that foods with a high amount of salt, sugar or fats can override hunger type senses with feelgood type senses and cause them to keep wanting more, more. But from the sounds of what he eats, I wouldn't worry too much about this - just perhaps be aware if he is having meals with avocado, nuts, cream, etc.
We tend to use these as catch-all plates, bowls, snack pots and freezer containers, they are about the size of my palm at the base. Amazon says 300ml, and he's currently having porridge with berries, apple and cinnamon (defrosted "smoothie mix") up to about halfway - so I'd guess 150ml. He might want all of it or he might not, (seems to be slowing down now 2/3rds in) but it's a fairly standard breakfast for him. For lunch he will probably have a similar amount plus some fruit (one of the big nuk cubes, which I'd estimate at 80-100ml, depending on how you fill them).
Otherwise I am totally in agreement with GlamGiraffe :)
DS2 is a much bigger eater than DS1 ever was. DS1 existed on mainly breastmilk until he was nearly two and gave me (and the health visitors and my mum) quite the fright thinking he would somehow waste away, and I got into all kinds of scrapes trying to "fix it", which in hindsight caused more damage than they solved. Of course he didn't waste away and still now just isn't very fond of food in general. He is 10 now and this morning was lamenting that his trousers don't stay up - he's a skinny lanky thing, his friends tease him (good naturedly) about his "stick arms". But so was I. In fact if I ever have struggles with my weight, it's because I'm borderline underweight and need to put it on. Same for my mum and my sister and his dad was never chubby either.
I was comparing their red books the other day and they are both on similar centiles for height - 75th. But DS1 is on the 50th centile for weight which makes him look like a beanpole, and DS2 is on the 91st centile for weight, so he has those scrummy baby arms that look like you could just screw the hands off, a buddha belly and thighs which require a larger size of nappy.