Hi, I have a Thule Ocean 200 roobox and was looking at the bags you can buy to go in it. It’s says it holds 4 bags and 75 litres each, totallly 300l but the capacity of the roofbox is 430l! Is there any room once the bags are in?
Not familiar with the specific roof box or the bags, but a roof box stated volume will be calculated as if it were filled with water that utilises every nook and cranny! Fitting anything in one that does not conform to all the odd 'corners' will reduce it's meaningful and truly useful capacity, you are highly unlikely to ever be able to 'fill it' to it's stated capacity unless stuffing it with things like loose duvets, sleeping bags etc., that conform to all the curved shapes.
The Thule bags are pretty regular 'holdall' shaped, so not really utilising all of the space in the box, as with any holdall(s), you'll have 'stuff space' for small items in all the spare 'corners' and gaps.
With my roof box, the regular shaped bags (ordinary holdalls) and tote boxes go in first, then an assortment of small and 'squishy' items get packed into the space left, both to utilise the space and stop movement of larger items.
Personally, not so keen on largish bags to go in the roof box, I've got a high roofed MPV which just compounds the problem, as you have to lift slightly heavy and unwieldy bags to head height (or over in my case!) to fit them in!
Beware of what you put in the roof box! The weight capacity is the VEHICLE roof/rail load limit, of which the bars AND the box weight must be deducted from, to give you your load capacity limit, it may well be lower than the bars/box weight limit! Those Thule bags alone weigh 0.75Kg each, which are eating into your load capacity!
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