If you're going to pack one sweatshirt for your travels, it should be an Outlier crewneck

If you're all about travel hacks, there's no better hack than having well-made clothing on your journeys. Outlier's Co/Weight Merino sweatshirt is one piece you should definitely have in your luggage on every trip. The sweatshirt is made from a combo of matte cotton and soft merino wool. When you put those two fabrics together, you have a sweatshirt that has a nice weight and structure while the merino keeps things cool and comfortable with its natural thermoregulating properties and breathability. 

$198, outlier.nyc