How much weight can your car carry on the roof? That box weighs 33 kg, a pair of roof bars is probably another 5-10 kg, if the max roof load is 50 kg you wouldn't be able to put much in the box.
We have this one, it's huge an older model, but it's fine huge box not as aerodynamic as the new ones, but it holds loads, it comes right up to the middle of the front window, ignore the old boy at the front lol
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My Octavia estate can take 75kgs on the rails,
I'm guessing my box and roof rack come to about 15ish KGS leaving me with 60kgs.
In the 550 litre box I have 4 camping chairs, 4 sleeping bags(2 are very bulky), 4 sims, 2 pillows, ehu bag and a few other small bags of bits n pieces. Its full to the brim at that and I'm guessing below the weight limits of the roof as a lot of it is bulky but light.
I picked it up 2nd hand for €60 which was a bargain. I'd be lost without it. My boot is approx 580litres so its effectively a 2nd estate boot up top.
I'm seriously tempted by the MD20, the 600L version which costs around £250 delivered.
The 900L version is super massive, the 600L seems a bit more sensible and will give me an extra 150L over my current set up, which isn't to be sniffed at.