So its back, breast cancer 2.0 - thanks so much

Drain canisters are too big to fit on ones bra. A shoulder cotton bag is the go. you will generally only need the drain for up to two weeks, usually less. You can shower with them no worries. I had two and would forget I had them and toddle off to the other room before I realised they were bumping along. Oops. They just sit on your floor at night. A bit awkward but not uncomfortable.