I have a nice leather LL Bean backpack too. It has tons of pockets, which, yes, is an issue with roaches, but if a home has roaches, I keep a smaller canvas bag in the car, I just throw in only what I need from the bag. The bag is beige, so I can see everything, no hideyholes, and I would put the hand gel in my pocket. I have also used a fanny pack, but I don't like wearing that.
In my Bean Bag, I can keep therm probe covers in one little pocket, alcohol wipes in the teeny pocket, hand gel in another. In a larger front pocket I have paper towels, soap, and a few plastic bags. On the larger side pocket I can squeeze in a smaller flat-style sharps container. Inside, there are two large pockets, one for my lab supplies, syringes, etc, the other for dressings in a zip lock bag, and then my cuff and scope and thermometer.
It gets heavy, b/c I also have a spanish book for healthcare professionals and a drug book in there. But, it is great for having my hands free while climbing rickety steps, but sometimes it gets so heavy, I feel like it will pull me backwards! I really don't travel light.