Heres how you can easily get more than 64 items in one slot!
Commands:
/setblock x y z chest (or any other container)
/blockdata x y z {Items:[0:{id:item,Count:numberOfItems,Slot:slotNumber}]}
1.8:
/summon ArmorStand ~ ~1 ~ {Equipment:[0:{id:item,Count:number}],ShowArms:1}
1.9+
/summon ArmorStand ~ ~ ~ {ShowArms:1,HandItems:[{id:item_id,Count:number}]}
1.11+
/summon armor_stand ~ ~ ~ {ShowArms:1,HandItems:[{id:item_id,Count:number}]}
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