We discovered the best Subaru Outback car camping mattress ever. This mattress is super comfortable, insulated, and fits the back dimensions of the car perfectly. This gear review talks about the Exped Megamat Duo 10 insulated self-inflating sleep pad (medium size, not wide long).
So, what size air mattress do you need for a Subaru Outback? An air mattress with the dimensions 72” x 41” x 4” will fit the back of your Subaru Outback perfectly!
To keep sleeping in the back of the Outback comfortable and straightforward, we found a terrific inflatable mattress.
You can buy the Exped Megamat inflatable mattress from REI.com or Amazon. Check both stores for the best pricing and to order the correct size. These mattresses sell out during camping season, so it is always good to check both stores for the correct product size.
On the first mattress test, we slept at a Sinclair parking lot in the middle of nowhere Wyoming (literally), and it took less than 5 minutes to inflate the mattress. If you do not have time to inflate the bed, it has a little hand pump (see little grey round thing in photos).
We slept well. This air bed was comfortable for the two of us. My husband and I are 5’5” for reference, and we both fit great, especially since we can stuff a bag on each side by the doors for a little extra shoulder room.