{"reviewed":"November 2026","units":{"dimensions":"cm","rectangularFootprint":"cm²"},"formulas":{"rectangularFootprint":"outside length × outside width","heightDifference":"outside height − inside height","orientation":"long side facing room: width = length, depth = width; short side facing room: width = width, depth = length","margin":"available dimension − corresponding outside dimension; full-withdrawal floor space compared with oriented depth"},"assumptions":["Published dimensions are approximate; rectangular bounding footprints include the protrusions covered by those dimensions.","A straight route perpendicular to the bed edge, with the box front initially flush with that edge.","The width is the narrowest clear opening and bay width; depth runs from the bed edge to the first obstruction.","Floor space is clear immediately outside the opening. Full withdrawal is a planning comparison, not a minimum lid-opening requirement.","All four margins must be positive to leave nominal space. Equality has no clearance. No universal movement allowance is assumed.","Lid rise, hand space, internal supports, floor conditions and permitted wheel direction require separate checks."],"products":[{"id":"really-useful-10-clear","name":"Really Useful Box 10L Clear","label":"Really Useful 10L","externalCm":[52,34,8.5],"internalCm":[46,29.8,7],"footprintCm2":1768,"footprintLabel":"1,768","heightDifferenceCm":1.5,"source":"https://www.reallyusefulproducts.co.uk/uk/html/onlineshop/rub/b10_0litre.php","wheeled":false},{"id":"really-useful-33-clear","name":"Really Useful Box 33L Clear","label":"Really Useful 33L","externalCm":[71,44,16.5],"internalCm":[60.5,37,14.5],"footprintCm2":3124,"footprintLabel":"3,124","heightDifferenceCm":2,"source":"https://www.reallyusefulproducts.co.uk/uk/html/onlineshop/rub/b33_0litre.php","wheeled":false},{"id":"smartstore-bedroller-60","name":"SmartStore Bedroller 60L","label":"SmartStore 60L","externalCm":[79,59,18.5],"internalCm":[70,51.5,16.5],"footprintCm2":4661,"footprintLabel":"4,661","heightDifferenceCm":2,"source":"https://www.orthexgroup.com/underbed-storage/1036-smartstore-bedroller-60-l-6411760609916.html","wheeled":true}],"scenarios":[{"title":"A low bay with a nearby wardrobe","height":12,"width":60,"depth":45,"floor":40,"explanation":"The 10L box leaves 3.5 cm above it. With its 52 cm side facing the room, its 34 cm depth leaves 11 cm inside the bay and 6 cm of floor beyond full withdrawal. Turning it uses 52 cm of depth, exceeding both the 45 cm bay and the 40 cm floor space. The two taller boxes exceed the 12 cm height."},{"title":"Enough space underneath, less room outside","height":18,"width":76,"depth":80,"floor":50,"explanation":"The 33L box leaves 1.5 cm in height. Its 71 cm side can face the room: 44 cm of depth leaves 6 cm of floor beyond full withdrawal. Rotated, its 71 cm depth still sits within the 80 cm bay, but exceeds the clear floor by 21 cm. The 60L box is 0.5 cm taller than this gap."},{"title":"A narrow opening into a deep bay","height":20,"width":50,"depth":80,"floor":75,"explanation":"The 33L box becomes a dimensional candidate with the 44 cm side facing the room and 71 cm running into the bay. That leaves 6 cm across the opening, 9 cm behind the box and 4 cm beyond full withdrawal. Its 71 cm side cannot pass the 50 cm opening. Neither the 59 cm nor 79 cm side of the 60L box clears that opening."}]}