(CNN) The Sony XB13 has long been our top pick of Bluetooth speakers for travel, packing big sound, great battery life and a road-ready fabric strap in a tiny cylinder you can take anywhere. Its successor, the new XB100, is largely the same and depending on who you are, that’s no bad thing. Sony’s latest pint-sized speaker offers a slightly refined design, refreshed color options and improved sound, with all the features we already loved on the XB13 (including the convenient ability to pair two for immersive stereo sound). Current XB13 owners don’t have much reason to upgrade, but what about those looking to buy a travel-friendly speaker for the…