Non spring, memory foam mattresses compress surprisingly well. Bigger than a pillow. Still weighs the same regardless of dimensions though. Anecdotally, I had

Non spring, memory foam mattresses compress surprisingly well. Bigger than a pillow. Still weighs the same regardless of dimensions though. Anecdotally, I had a fantastic experience ordering one through Argos (UK brick and mortar catalogue store that is finally getting its act together online), same day delivery on a Sunday, fit the bill of "I need a cheap mattress tonight". If I didn't need it same day, then there is no way I'd buy something as subjective as a mattress online..