The Australians on the list, you might like to check this out. I have also posted this on the bowl thread, but I know I searched hard for a cup.
You might want to check out the Decor range. This is their standard range, not the new microwave range, which is significantly heavier on my "one in each hand" scales.
The original range have good lids for solids, 100ml markings, stack well and let you compact down(stack) as you eat the cereal or crackers you store in them. (10 Weetbix in an 800ml rectangular container)
The 800ml in rectangular or round are about 46g plus 18g for the lid. cost around $3.00 at Coles or Woolies.
They do a nice, short round 350ml one which I think is around 29g plus lid (mine is at work at the moment. I'll edit on Mon) Very tip resistant due to the straight sides and low height. I've drilled a hole in the lid on one side, with a breather opposite, to make a drinking lid. No handle but the reinforcing rib around the seal gives a burn proof way to hold. In reality polypro transmits less heat than even ti.
The practical working temp (ductile, flexible semisolid) is around 160 C, so boiling water has no effect on stability of these containers, like it does on PET. Which leads me to the lightest, cheapest practical bowl I have found so far…….
The Coles brand 1kg honey container. Take the plastic bail handle off this and you have an approx 800ml polypro container with a pretty good lid. The jar is 27g and the lid is 10g. The wall thickness is less than the Decor, but even filled with boiling water, it's still suitably rigid. I haven't tried stacking yet, as I'm only half way through the second jar, but with my kids, I reckon on about ten days until it's ready. (I'm not sure how many of these I put in recycle before I realised how ideal they were.
