On the frequently long approach to the snowline, or when the terrain does not warrant the use of an axe, it is common for ice axe(s) to be carried on a rucksack. Many rucksack models come with one ice axe loop (on the outside of the rucksack at its foot and generally in the middle), together with a device (a strap or a bungee cord) to attach it to the main body of the sack. Rucksacks with attachment points for two ice axes are also available, and these are popular for use with ice tools.