Round jars with straight sides and independent screw-top caps. Nalgene Wide Mouth Jars - Sold in Pairs.
Nalgene says:
Protect your eats by storing your food in air-tight storage containers. Extra wide Wide Mouth opening makes it easy to scoop what you need when you need it. Shatter resistant and dishwasher safe.
Wide mouth means its easier to spoon your instant coffee in without making a mess. These jars are heavier than others of a similar volume however the straight sides make them particularly useful for creams butter spices etc.