The standard weight (derived by US NIOSH studies) that can be lifted in workplaces is 30 kg, hence most heavy packages are 25 kg (think of a bag of cement/plast

The standard weight (derived by US NIOSH studies) that can be lifted in workplaces is 30 kg, hence most heavy packages are 25 kg (think of a bag of cement/plaster/etc.) in most EU, see: https://news.ycombinator.com/item?id=31465982 https://news.ycombinator.com/item?id=31465982