Took it for a 350 mile test ride and it performed great. Plenty of space for a bivy, spare tubes, tools, device charging cables and a battery pack. Also had my armleg warmers and a base layer in it. Used the top netting for a spare tire and a bike lock. Feels very durable and the compression bag works great. The only downside is a bit of sway out of the saddle. Did not affect the bike handling at all.