Why not save buying a cage for "overnight trips" later? 80% of the members on here that aren't breeders, use NIC cages, dog kennels or just x-pens and dont seem to have problems.
If you have the playpen why are you in a rush to buy a cheap plastic cage like that? Just keep the rabbit in the play pen.
Its too small to use as a cage, and then to say there is the play pen... well just keep the bun in the play pen, save your money.
You made to post to find out if that cage is good enough. It's not. There are plenty of options you could purchase now before december that would be good long term cages.