This 20-liter pack is extremely comfortable to carry and packs away a lot of gear, holding it all close to your body so that you can use it for hiking, mountain biking and even climbing.

This graph shows the cost of petrol. It shows that 20 litres will cost £23 or £15 will buy 13 litres. Gradient = \(\frac{\text{change up}}{\text{change right}}\) or \(\frac{\text{change in y}}{\ ...

According to Water UK, 46% of people believe their household uses 20 litres of water day, but it’s actually almost 142 litres per person. This is a major problem, because according to non-profit ...