50 ltr I believe. Will confirm tomorrow.Visit to Ikea today to get one of these beds and a mattress topper, thanks to Danny for the tip. Photos below. One thing, can you let me know the type of useful storage boxes please, as the link didn't work and want to get the right ones.
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Currently entering our 2nd week touring Europe and using this bed and it is super comfy. We do have a mattress topper on which certainly helps.