Returning to work 😩

So I’ll be returning back to work soon as a first time mom and I’m exclusively breastfeeding my 10 week old and I was wondering how you moms do it? As in how much milk do you save in each container or bag? How much should you save? I have about 40 bags saved up now. Is that enough? How do you ladies prepare it for sitter/ husband/ daycare? Do you leave it in bags? Put it in containers or bottles?