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Wegobuy offers 2 ways to get rehearsal packaging, both costing 20 yuan.
The first one seems much better, it actually gives you a concrete offer you can accept or deny, while the second one updates the weights in the warehouse, still leaving you guessing how much it will cost in the end. It still locks you down on the shipping service and value-added service choices, so that's not an advantage either. It's hard to imagine that lack of information working in your favor.
The only reason to choose the second option is if you are slightly over a weight limit, for instance your items weigh 2.1kg and you want to use EUB. Then it's impossible to submit your parcel and you have to choose the second option. After the rehearsal packaging you're hopefully under the weight limit.