Travelers looking for a new suitcase should take a close look at the thoughtfully designed and thoroughly durable Timbuk2 Copilot series that comes with a small discount trick. Stop HereDepending on your travel budget, a Timbuk2 bag might not be for you. Their Copilot series comes in 4 different sizes: 42, 52, 80, and 108 liters. You can review all the dimensions here but basically:42L bag : Think of it as a large carry-on. Save Some Money On A Timbuk2Overall, there’s a lot to like about the Copilot series.