Bought this [[https://www.blacks.co.uk/15989081/eurohike-nepal-65-rucksack-15989081 https://www.blacks.co.uk/15989081/eurohike-nepal-65-rucksack-15989081]] and it has aluminium supports at the back. Am planning to use it for days out etc. Do you take them out and if so, how? Pic attached