Stronger than the average bottled tea
Pure Leaf Unsweetened Black Tea carries 54 mg of caffeine in its 18.5 fl oz bottle, by PepsiCo’s own figures. Per ounce, that runs a bit ahead of the generic bottled iced tea average (about 9 mg per 100 g, or roughly 45 mg in a 16 oz bottle), likely because it’s brewed from real leaves without dilution for sweetness, unlike many blended bottled teas.
That puts it closer to home-brewed iced tea, which USDA measures at about 72 mg for a 12 oz glass, than to the weaker end of the bottled category.
A real leaf, not a blend
“Unsweetened” and “Pure Leaf” both point at the same thing here: this is closer to a straight-brewed tea than many bottled competitors that dilute the tea to balance added sugar. That’s consistent with USDA’s figure for home-brewed black tea, 47 mg for an 8 oz cup, scaling up reasonably to this bottle’s 18.5 oz size.
Pure Leaf makes other flavours and a sweetened line too; this figure is specific to the unsweetened black tea bottle, and a different Pure Leaf product may carry a different amount, so checking the specific label is worth doing if the number matters.
Where it fits in a day
At 54 mg, a bottle is far under the 200 mg single dose EFSA assessed as safe for healthy adults. Seven bottles, 378 mg, would come close to the 400 mg daily figure the FDA cites. In pregnancy, where ACOG uses a 200 mg daily ceiling, three bottles still fit under the day’s allowance.