I bought the cheapest Top Box on Aliexpress for the 1250GS! 

I brought a Chinese 52L plastic Top Box for $50NZD around 25 quid and mounted it to a KTM 1050 ADV bike. After using it loaded for a two week 3500 km trip, nothing bad happened. it was still mint at the end of the trip :) Note:- a cheap way to adapt the mounting plate to a bike if needed, can be to use a 1 cm thick plastic cutting board to make an adaptor. They're cheap as chips and very strong. They'll take a coat of satin black paint if you don't like the raw off-white look.

Thx, Do not forget that most of the boxes in the shops come from China.

Cool art work on the street!

Cool bro

Be interesting to see how it survives... The quality of some manufacturer-branded accessories has plonked down in my experience. At the same time, price has gone in the up direction. So easy to buy an expensive bike and add £6k to that with manufacturer add-ons.

Now you need the wireless charger/phone holder that clips onto where the bmw navigation goes from aliexpress also. £25