I would assume you meant the gallon glass jugs that the cider came in. Those are definitely NOT meant to handle pressure. I have several, and they are great as growlers where the CO2 is already dissolved into the beer, but they will not handle the pressure of a room temp carbonation.
Worst case, go grab some 2 liter soda bottles and carbonate in those. They will easily handle the pressure.
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!