Hey Mike,
A couple things... first, if you have a small enough frame you can fit snuggly into the "Goodnites" XL Pull-ups for boys. I weigh 135 and have a 30" waist and can still wear and wet in these. Plus, they are more juvenile looking, with a race-car print to make you feel like a big boy.
As far as storing the not-yet-used diapers, you might try a regular looking back-pack to double as a diaper bag for yourself. At least that way all your diaps are in one zipped-up location. And you can always throw the bag over your shoulder in a casual manner and take it with you when you leave the house. Don't forget to be careful about disposing of your wet ones. Sometimes there are reasons for a person to look in a trash can.
You also mentioned in your post that wearing ( putting on ) a diaper arrouses you. I think it's neat that you are willing to admit that to yourself and in a posted notice. Wearing diapers, and diaper play, is also sexually stimulating to me.
Currently, I am in search of an adult baby-boy who wants to be adopted for the reasons of being able to babied and to be kept in diapers 24/7. But even if this is not for you... I'd still love to chat online with you some time and maybe engage in some erotically suggestive diaper talk.