The majority of high-quality swags have mattresses inside, and these are built-in to keep you protected from the hard ground. It depends on the budget you have because sometimes a camping tent has a thin mattress. If you have a back or body issue, you can increase the budget, and keep yourself comfortable on the camping trip. If your swag doesn’t have a mattress, you can try using a camping stretcher and placing your swag on top of it.