the following details out what needs to be brought in you up

此句中的out为动词,
英语释义为:to state sth.openly and publicly; be made known; be disclosed or revealed;
汉语释义为:暴露,揭露；使某物显露；公开;使...知晓;如:
The truth will out.真相终将大白于天下.
结合本句的语境,out可译作"公布,显示".
The following details out what needs to be brought in your upcoming China trip.
句型结构分析如下:
The following details(主语)+ out(谓动)+
宾语从句作宾语:[what needs to be brought+(介词短语作状语:in your upcoming China trip)]
句意：下面的细节显示了在你即将到来的中国之旅中你需要带的东西.