If I am checking luggage, I have no problems with the Bodum in my B&R 20" luggage in expanded mode. I don't think it will fit if I am carrying on with my luggage in the collapsed mode.

The exact measurements are on Bodum's site but it's not terribly large if you compare it to carrying a 16 ounce ceramic coffee mug for an immersion heater. This was the tipping point for me. I realized I can't use the immersion heater in the paper or Styrofoam cups provided by the hotel. This forced me to pack a tall mug with it for the boiling process.

The Bodum is still ultimately larger but it eliminates a lot of hassle. The immersion heater had a lot of rules about how to prevent it from burning out.

Also, Bodum is a pretty reliable brand. I bought at Zappos since they have a generous return policy. Amazon.com's price was higher than retail but Zappos was right at $50.