I added a front bag to one of my other bikes, and loved it, so I went looking for something similar for my Sunstreaker, my Tern HSD. This bag sits nicely on my Hauler Rack, and the front attaches quickly and easily with a small strap and buckle. The rear attaches with the same strap that closes the top of the bag - potentially a weakness in the design with one strap doing double-duty, but time will tell. The bag holds a dinner for two with ease, with room for far more. I've only used it in the rain once, but it rolls up easily and keeps water out fully!

I'm using it with a Tern Hauler Rack on a Tern NBD S5i. Fits the rack well, and I especially like the quick snap-off feature of its Fidlock buckles.

Lets me take the loaded WeatherTop directly from my bike into the kitchen to unload groceries, or elsewhere in the house with other items, in a single carry step.

No need for many separate steps to pull out & carry the individual items piecemeal from a bag fixed on the bike. The bag can also accompany me while shopping, especially with it sitting open in a grocery cart.

Has a large capacity, without making my NBD ungainly or difficult to balance riding. Currently using it in its bucket mode for convenience.

I haven't been in rain with it yet, so cannot comment on its weather resistance using the roll top mode. Nor do I know its long-term durability. But other Tern-branded accessories I've owned have been excellent, and the WeatherTop looks & feels tough & strong.

I recommend the WeatherTop Bag for Tern bikes with Hauler or Transporteur front racks, or suitable rear rack configurations. (Refer to the Tern Cargo Guide)