I bought the ROCKBROS bikepacking bag after hearing advice from a friend. I am pleased with the design and construction of the bag. I haven’t used other seat bags, but the construction seems to be on par with the (much) more expensive bags out there. The material is nice, waterproof nylon. No zippers on this, which is great. It is quite stable on the big when packed properly. Even under a heavy downpour, I can rely on this bag. It features a roll-type closure to keep my stuff dry at all times.
