français vers anglais Technique / Génie Vente au détail Supermarkets

Another term appearing in a supermarket quality inspection list:

They are talking about the 'réserve', which I have translated as 'store-room'"

La poubelle est vidée, les rolls correctement disposés.

I am completely stumped as to what 'les rolls' are here. Possibly something to do with the bin (poubelle) itself? Could these be bin liners or something? All sounds very simple, but not if you have not come across the term in the context and it is a difficult one to research (all you get are Rolls Royces! unless of course they are saying that the bins are emptied and the boss's Rolls is correctly parked outside! :) so all is well with the world)....