i currently have an asda s/s. it just doesn't keep the water hot long enough, i think it's because i keep it in an outside pocket of my bag. it takes me 90 minutes to commute in. does anyone know of either a s/s one that will keep contents boiling hot for more than 6 hours or a robust glass type. i'm paranoid about it breaking. if it broke it would be a complete disaster and trash everything in the bag (even tho the pocket is on the outside) or has anyone got experience of the jetboil system?