Please forgive me, I don't know how much you know about camping gear, I'm hoping you know a great deal more then I do since you are planning such a vast trip, but I'm going to pretend you know nothing or very little. There is a large assortment of camping gear you can buy from real expensive to real cheap...most cheap stuff, if you read the reviews on a particular item and it gets high reviews will work just fine. When doing a world tour stuff will wear out along the way, even the really good stuff will wear out along the way. I do some touring, nothing major like you're planning, but I have found that a cheap $13 stove for example is as good as a $120 stove, the one I got from Etekcity works fantastic and it got 4.5 stars from over 2000 users on Amazon (not sure about how easy it is to find fuel for this stove in other parts of the world but here in America it's fine). There is even cookware at Walmart that has been field tested and discovered to be as good as the more expensive stuff. I even found a set of panniers from Axiom called the Monsoon 45 to be as good as Ortlieb best stuff in fact in some aspects better for half the price. So do a lot of research first before diving in and spending a load of money on stuff, there are even You Tube videos on how to go cheap backpacking (which the principles are the same as cycle touring), and these products were tested by backpackers who thought they compared to the really good stuff equally. There was a guy on the internet who spent $400 on a lightweight single person tent only to find out after it wore out after several tours that cheap one from Walmart lasted about 1/2 as long but it was only $50 so after several tours it ended up costing him $100 instead of $400 for the same length of use but the cheaper tent weighed about 6 ounces more which he didn't care. Amazon is a great resource because you can find products that have been used by 100's if not 1000's of people, that don't cost a lot yet had high reviews, while some products that were also cheap had low reviews, so it just depends on the manufacture of said cheap item.