Vivo V5s is not much heavy. Despite of having 5.5 Inch display and bigger battery, the phone weighs just about 154 grams.
Yes, you can use memory card in this phone.
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.
Yes, Vivo V5s does have app clone function.
Yes, Vivo V5s 64GB comes with front camera LED flash.