A standard nip or shot in a bar is 30 millilitres. A mix of jack and coke in a 200 ml glass at a bar or pub is 30/ 200 without factoring in ice. That works out to 15% alcohol by volume. However, "Double Jack" is 6.9% of a 330 ml bottle is 22.77 ml...75% of a full nip 6.9% of a 375 ml can is 25.87 ml.... it is 86% of a full nip It is reprehensible that the manufacturers pretend these mixers are 1.8 standard drinks.

Double jack, in a bottle? You really cannot go wrong with this.