Minecraft 1.9 Multiplayer backpacks

/summon FallingSand ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:FallingSand,Block:redstone_block,Time:1,Passengers:[{id:FallingSand,Block:activator_rail,Time:1,Passengers:[{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false},{id:MinecartCommandBlock,Command:"/scoreboard objectives add WM dummy"},{id:MinecartCommandBlock,Command:"/scoreboard objectives add age dummy"},{id:MinecartCommandBlock,Command:"/scoreboard objectives add Facing dummy"},{id:MinecartCommandBlock,Command:"scoreboard objectives add Craft_I dummy"},{id:MinecartCommandBlock,Command:"summon ArmorStand ~3 ~-2 ~ {CustomName:TogAct,Marker:1,NoGravity:1,Invisible:1}"},{id:MinecartCommandBlock,Command:"scoreboard objectives add Craft_A dummy"},{id:MinecartCommandBlock,Command:setblock ~6 ~3 ~ chain_command_block 4 replace {auto:1,Command:"/execute @a[score_WM_min=1] ~ ~ ~ detect ~ ~1 ~ air 0 /setblock ~ ~1 ~ minecraft:ender_chest 0 replace"}},{id:MinecartCommandBlock,Command:setblock ~6 ~2 ~ chain_command_block 1 replace {auto:1,Command:"/execute @a[score_WM=-1,score_Facing_min=3,score_Facing=3] ~ ~ ~ /summon ArmorStand ~ ~.25 ~-.38 {Small:1,CustomName:Bag,UUID:5-6-7-8-9,Invisible:1,Invulnerable:1,NoBasePlate:1,NoGravity:1,Rotation:[-180f,0.0f],ArmorItems:[{},{},{},{id:chest,Count:1}]}"}},{id:MinecartCommandBlock,Command:setblock ~5 ~2 ~ chain_command_block 5 replace {auto:1,Command:"/execute @a[score_WM=-1,score_Facing=1,score_Facing_min=1] ~ ~ ~ /summon ArmorStand ~ ~.25 ~.38 {Small:1,CustomName:Bag,UUID:5-6-7-8-9,Invisible:1,Invulnerable:1,NoBasePlate:1,NoGravity:1,ArmorItems:[{},{},{},{id:chest,Count:1}]}"}},{id:MinecartCommandBlock,Command:setblock ~4 ~2 ~ chain_command_block 5 replace {auto:1,Command:"/scoreboard players add @a[score_WM=-1] WM 1"}},{id:MinecartCommandBlock,Command:setblock ~3 ~2 ~ chain_command_block 5 replace {auto:1,Command:"/scoreboard players remove @a[score_WM_min=1] WM 1"}},{id:MinecartCommandBlock,Command:setblock ~3 ~1 ~ chain_command_block 1 replace {auto:1,Command:"/scoreboard players set @a[rym=-45,ry=45] Facing 3"}},{id:MinecartCommandBlock,Command:setblock ~4 ~1 ~ chain_command_block 4 replace {auto:1,Command:"/scoreboard players set @a[rym=145,ry=-145] Facing 1"}},{id:MinecartCommandBlock,Command:setblock ~5 ~1 ~ chain_command_block 4 replace {auto:1,Command:"/scoreboard players set @a WM -2 {Inventory:[{Slot:102b,tag:{display:{Name:\\\"Backpack\\\"}}}]}"}},{id:MinecartCommandBlock,Command:setblock ~6 ~1 ~ chain_command_block 4 replace {auto:1,Command:"/execute @a[score_WM=-1,score_Facing_min=4,score_Facing=4] ~ ~ ~ /summon ArmorStand ~.38 ~.25 ~ {Small:1,CustomName:Bag,UUID:5-6-7-8-9,Invisible:1,Invulnerable:1,NoBasePlate:1,NoGravity:1,Rotation:[-90f,0.0f],ArmorItems:[{},{},{},{id:chest,Count:1}]}"}},{id:MinecartCommandBlock,Command:setblock ~6 ~ ~ chain_command_block 1 replace {auto:1,Command:"/execute @a[score_WM=-1,score_Facing_min=2,score_Facing=2] ~ ~ ~ /summon ArmorStand ~-.38 ~.25 ~ {Small:1,CustomName:Bag,UUID:5-6-7-8-9,Invisible:1,Invulnerable:1,NoBasePlate:1,NoGravity:1,Rotation:[90f,0.0f],ArmorItems:[{},{},{},{id:chest,Count:1}]}"}},{id:MinecartCommandBlock,Command:setblock ~5 ~ ~ chain_command_block 5 replace {auto:1,Command:"/kill @e[type=ArmorStand,name=Bag]"}},{id:MinecartCommandBlock,Command:setblock ~4 ~ ~ chain_command_block 5 replace {auto:1,Command:"/effect @a[score_WM_min=1] slowness 1 125"}},{id:MinecartCommandBlock,Command:setblock ~3 ~ ~ chain_command_block 5 replace {auto:1,Command:"/scoreboard players set @a WM 3 {SelectedItem:{id:minecraft:leather_chestplate,tag:{display:{Name:\\\"Backpack\\\"}}}}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-1 ~ chain_command_block 1 replace {auto:1,Command:"/execute @a[score_WM=1,score_WM_min=1] ~ ~ ~ /fill ~3 ~3 ~3 ~-3 ~-3 ~-3 air 0 replace ender_chest"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-1 ~ chain_command_block 4 replace {auto:1,Command:"/execute @a[score_WM=-1] ~ ~ ~ /scoreboard players set @e[r=3,type=ArmorStand,name=Bag] Age 1"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-1 ~ chain_command_block 4 replace {auto:1,Command:"/scoreboard players set @a[rym=45,ry=145] Facing 4"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-1 ~ chain_command_block 4 replace {auto:1,Command:"/scoreboard players set @a[rym=-145,ry=-45] Facing 2"}},{id:MinecartCommandBlock,Command:setblock ~6 ~-2 ~ chain_command_block 1 replace {auto:1,Command:"execute @e[score_Craft_I_min=9,score_Craft_I=9] ~ ~ ~ execute @e[score_Craft_I_min=10,score_Craft_I=10,r=1] ~ ~ ~ kill @e[type=Item,r=3,score_Craft_I_min=9,score_Craft_I=11]"}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~ chain_command_block 5 replace {auto:1,Command:"execute @e[score_Craft_I_min=9,score_Craft_I=9] ~ ~ ~ execute @e[score_Craft_I_min=10,score_Craft_I=10,r=1] ~ ~ ~ summon Item ~ ~0.5 ~ {Item:{id:minecraft:leather_chestplate,tag:{display:{Name:\\\"Backpack\\\"}},Count:1}}"}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~ chain_command_block 5 replace {auto:1,Command:"scoreboard players set @e Craft_I 10 {Item:{id:minecraft:chest},OnGround:1b}"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~ repeating_command_block 5 replace {auto:1,Command:"scoreboard players set @e Craft_I 9 {Item:{id:minecraft:leather_chestplate},OnGround:1b}"}},{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-3 ~-1 ~ ~ ~ air}},{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block},{id:MinecartCommandBlock,Command:kill @e[type=MinecartCommandBlock,r=1]}]}]}]}