try this:
--Deposit Items
local depotbp = 'fur backpack'
local lootbp = 'blue backpack'
local stackbp = 'green backpack'
local nostackbp = 'orange backpack'
depotaction('depotbp', 'lootbp', {'a','stackbp','b','nostackbp'})
make sure that you have all backpacks and set categories in supply tab like this: