Oxford DryStash T15 - Black

Excellent product and just the right size to sit on the pillion seat. Disappointed it doesn't have a carry handle and only has a shoulder strap even though the picture shows a handle. Comes with lots of tie down straps but they could be a better design. I've modified it slightly by adding a hard board to the bottom of the bag to ensure it doesn't get pulled down over the seat when fitted.
Still for £25 it's good value.

This bag is unbeatable for the cost, comes with a comprehensive selection of straps and is totally waterproof.
I put it on a front rack then did a weekend trip in awful weather and it was faultless.
The litre sizing is deceiving, this bag measures more than 15l when you do the math on the dimensions so bear that in mind when comparing with other brands 15litre offerings. It means this is even better value. I'm very pleased with it.

Great Bag, wanted a "grab n go" bag for an overnight ferry trip, perfect size, durable decent zip and Velcro flap is ideal. Also went through a monsoon and stayed watertight, all good.