its cool if you have backpack in minecraft survival add this plugins to 
server
Plugin thread : https://www.spigotmc.org/resou…epacks-mc-1-7-1-12.19286/
Info : Minepacks is a backpack plugin with different backpack sizes,it is like virtual chest!
iam using playervault but this plugins have a Bug/Glitch items they can have unlimited items
