Roofrack Steel cage type.

Hi LAZYLUX,
I guess it's going to depend a lot upon what you're wanting to store up there. I try to only store light, bulky items up top, in order to keep the centre of gravity as low as possible, and to not over load the roof's carrying capacity. It all then goes into a canvas roofrack bag, and tied down with a number of straps to a) secure the load, and b) prevent the bag billowing.

Have a look at Award stackable boxes at Bunnies too. Vertical ribbed walls, modular in 3 sizes, with hinged lids. They're not heavy. I've used them in the cabin over a number of rough trips and they work well.

Wholeheartedly 2nd what Lazylux and Pk said, we carry only 1 solid box on the roof and thats a nally bin, it usually has the likes of grease gun, water blind, spare tube, sand pegs, things that arent a daily item. All other gear goes into Tarpol bags with double closures to keep out the dust and rain. Much easier to handle putting up and getting off, and as said keep the weight down to the minimum for obvious reasons.