MSR Stove disclaimer:Use MSR® fuel bottles only. Non-MSR fuel bottles may leak fuel, resulting in fire and injury.The threads on these bottle do share the same thread count as those produced by MSR, but these threads seem to be aligned at different angles. Though this bottle may work, this will most certainly cause threads to be striped & some leaking may occur.I think that is not quite right. The threads are the same, thats not a problem, no damage will be done to the threads. However, the lip around the top of the msr bottle is thiner than sigg, optimus etc.; so the pump gasket fits better on the msr. If you are careful putting the pump on it will work fine, but the msr bottle is a better option if you have an msr stove.