Sorry for being off-topic, but why with all the advanced technology today I have to manually copy ounces and pounds into Google to learn how much it is? Instead of adding dark themes and material design, it would be better to add a unit converter. Also do you really need a power bank for a 2-day trip? In airplane mode a phone can live like 2 weeks.
1 oz =~ 28 grams is a really useful conversion to remember (signed, an American living in Europe)
Also matters when your buying things for recreational purposes. Especially when only buying points.