Vivo V5s is not much heavy. Despite of having 5.5 Inch display and bigger battery, the phone weighs just about 154 grams.
Vivo V5s have 4GB single channel RAM.
You will get Vivo V5s, Vivo XE100 earphone, User manual, Micro USB to USB Cable, USB Power Adapter, SIM Ejector Pin, Protective Case and Protective Film (applied) as in-the-box accessories.
No. You cannot record 4k videos.