Hi sort of new to this, done a brew as a student, but starting again from fresh realy. Got a kit and as i work in a pub i get loads of empty 330 ml stubbies. Hienakin(dont think that is the right spelling), stienlager, stella, carlesberg, ampstel etc not twist top. Are these safe to use ie( exploding), as the woman in the shop said dont they could explode .she suggested i use swappa crate 750 ml bottles instead. I like the size of a stubbie. Just wondered what peoples thoughts were. Also got a heat mat any ideas, its cold in nz…