Stanley jar which you've seen me use before many times (and which I recommend highly) and the Thermos brand Hello Kitty jar which I hadn't used before. First thing I noticed is that the Thermos is much lighter. Of course, it is smaller (I have the 10 oz version), but also the lid is plastic and there seems to be quite a bit of heat loss through the lid. Immediately after filling the jar and closing the lid, I could feel it getting warm right away. The Stanley has a double lid: an inner plastic screw lid which is set inside the jar, and an outer plastic-lined metal cap which can be used as a bowl. If there is heat loss through the inner lid, it's not detectable through the outer lid, as fas as I could tell. I tested the Hello Kitty jar with boiling water, and found that the temperature of the water began dropping within an hour after sealing. That was pretty disappointing to me. We'll see what my preschooler says. Both kids toted along a side bento filled with strawberry, grapes, cara cara wedges, broccoli and carrots.
@makiwi on twitter, who has embarked on a labor of love to translate and update the rest of us on the news from Japan, seemingly without sleep. If you are looking for a way to help, please consider making donations to The Red Cross at IFRC.org or Doctors Without Borders at doctorswithoutborders.org.