Overload flask

An Overload flask is a potion flask originally containing six doses of Overload. It is created by using overload on a potion flask. Each dose of Overload will improve your combat stats.

The flask is made by blowing robust glass, requiring 89 Crafting and giving 100 experience. Red sandstone can be mined at Oo'glog and smelted using the Robust glass machine also located at Oo'glog.

To decant the potion into the flask, one must have at least 6 doses of overload in their inventory, as well as one or more potion flasks. Using the flask on the potion will open a menu to decant them. The optimal inventory setup for decanting potions is 17 4-dose potions and 11 flasks.

After all six doses have been consumed, the flask will shatter and disappear.

Assuming that the potion flask, all 3-dose super potions and secondary ingredients for extreme potions are bought on the Grand Exchange and a scroll of cleansing has not been used, each overload flask costs. This amounts to about per dose,  per hour, or  per second of effect.