For my 2017 Outback 180, I bought a 35litre/9.2 gal shallow Tubtrug for $30 on Amazon. They are a flexible rubber garden type bucket, it was a snug but perfect fit once installed. Worked out perfectly. With the smaller hatch on the 2019 Outback I’m not sure if this size would work or not, but I’m sure gonna try! If not, I’ve seen similar oval shaped ones, there has to be an inexpensive solution, shame it’s not included, would have expected at least in the camo model. I usually keep my flares etc in the front, if I can’t find an appropriate tub I’ll just use roll top dry bags for the time being, although it would be nice to access emergency items quickly without having to dig out a bag. Plus it was an easy control for whether or not the front hatch is leaking. In my 2017 the round hatches seemed to let most of the water in, the tub usually stayed dry. So happy to see them the the 8” rounds, they warped in the sun and the gasket always wanted to tweak.