How would I save a players inventory?

I made an inventory system that basically works by a player purchasing something and it being cloned from the Replicated Storage into a GUI which has UIGridLayout in it to position them, but I want to know if there's a better solution than having a bool value such as (ownsitem_1, ownsitem_2...) because as of now doing that would be tedious.

Ok so I have considerable experience with inventories, I use them all the time. The best way I believe to do this is by using a folder to either store the data needed with named data objects like so - - when the player joins you can clone this to the player like so -

game.Players.PlayerAdded:connect(function(plr)
	local newFolder = game.ServerStorage.Inventory:Clone()
	newFolder.Parent = plr
end)

You would want to load the data into the folder, this can be done with datastores as so -

local DSS = game:GetService("DataStoreService")
local invStore = DSS:GetDataStore("inv")

game.Players.PlayerAdded:connect(function(plr)
	local newFolder = game.ServerStorage.Inventory:Clone()
	newFolder .Parent = plr
	local plrData = invStore:GetAsync("USER_"..plr.UserId)
	--Then to test if the data exists
	if plrData then
		--Player has data
		for index,value in pairs(newFolder:GetChildren()) do
			if plrData[value.Name] then
				value.Value = plrData[value.Name]
			end
		end
	end
end)

This should load the data into the folder from the datastore, now you want to be able to save. This is simple enough -

game.Players.PlayerRemoving:connect(function(plr)
	local data ={}
	for index,invData in pairs(plr.Inventory:GetChildren()) do
		data[invData.Name] = invData.Value
	end
	invStore:SetAsync("USER_"..plr.UserId, data)
end

Now the data should load and save. You can edit the data easily enough, for example -

plr.Inventory.Stone.Value = 100
--or
plr.Inventory.Fly.Value = true

I hope I have helped and if there is something broken just ask!