Instantcustard · Today 21:37
5 litres is 5kg - a lot too carry unless you really think you'll need it. I've never carried more than 1 litre.
Do you hike in vast, barren areas with very high temperatures? A litre is fine in the UK and you're likely to be able to find water in hill streams, but in hot, arid countries, a decent amount of water is essential.
I was once working in Karatha, Western Australia and two of us had to drive about 250 km, typically 3 hours, to Port Hedland. We were told to take a case of water each, even though there is traffic, you could wait for hours, if broken down.