My daughter is having packed lunches. I have bought various sistema/klip it boxes but then it occured to me they will need to be insulated so need to be in a thermal bag anyway. A lot of the "character" lunch bags I saw today in supermarket will not fit a lot of these boxes inside. It then occured to me that she will also need a drink which will definitely not fit inside. I saw some where the drink was in a holdall fitted in a loop in the sde but these lunch bags were even smaller. Any ideas on the best option on what to buy? Is she going to need a seperate rucksack for lunch? Many thanks