Since we don't have the one liter bottles here in the states that our Canadian and European friends have, I found the next best thing... Good ol' (lousy) American beer bottles in 40oz. sizes! Much better than the plastic Delta1 "Datatainers" these brown glass bottles with metal caps are great for storing oxygen-sensitive solutions and work out to be cheaper than "photography containers." While you could drink the beer, honestly, I'd suggest dumping it down the drain...

Turns out 5l of Xtol fit *perfectly* in four such bottles with about a 1/4" of an air gap each!