I'm based in New Zealand, and we are a long way from anywhere, so I've been researching travel rods for a while now for my fishing trips. Rod technology has improved immensely, and 4-5 piece rods are a good option now. I'm starting to turn into a collector, as I have around 11 travel rods now, and often hunt down obscure models.
It depends what you are after of course, but I quite like the blanks on the Fox Trek Travel rods. They have recently stopped making them, but there are a few floating around stores still if you do some searching. The Okuma Nomad series are solid rods and good value, though they tend to be 3 piece and a little longer to transport. The Daiwa travel rods also fit into that category, being mostly 3 piece. They do the Saltiga G and Ardito travel rods. Shimano has their Travel Concept series, and have everything from 3 to 5 piece rods for a variety of applications. Penn also do a few, being the Rampage and Powercurve Recon Travel series.
The G-Loomis and St Croix rods get more expensive, plus there are a number out of Japan and Europe. The Majorcraft Bone series travel rods are extremely good value and very compact, but also extremely hard to find!
I tend to like rods that come with a hard travel case/tube. They can be a bit bulky, but you can always leave the case behind if you choose. It helps to ensure your rod arrives in good condition when you order it (I've had a few damaged in transport) and gives you protection in your luggage if you have a soft sided bag or something heavy packed with it.
If you can be a bit more specific about what you are targeting and their size, and whether you want spin or conventional, I could point you towards some options that I have researched.