Hi, I know this is a bit of a strange question but..... my DS is going on a school trip on Friday and has to take his inhaler with him (even though he's only usually affected by viruses, so it is cold-related...), and I'm worried about it getting hot as it will be in his backpack all day and with these high temperatures.... are they safe to carry around? Sorry, am just worried about it doing something in this hot weather and in my over-active imagination it has exploded!! Thanks.