Just a quick thought - what with you mentioning smelly pits and all .
I am assuming that you are talking about taking a roll on deodrant, as aerosols will definately not be allowed on the plane in your hand luggage whether they are bought before, or after, security.
I bought a little weight scale from Amazon for about a £5 that you can hook your suitcase to and lift up yourself. This is particularly handy for the return journey with all your extra stuff you have bought.
If you REALLY need hand sanitiser (which I know I do) to save of liquid I buy the individually packed wipes and throw a stack in. I even get kids one that smell nice.
I know there is always food on the plane but I always bring small packets of snack just incase and lolli pops or hard candy (which my kids are not allowed at home) for those emergency please be quite/do what I ask moments