Boobs on a budget

Uuuu.. no.
Not a tube top. Sports bra kind of flattens breast forms.
Where as a full coverage or a molded cup bra will cover all breast forms and with the added rope or harness, everything will stay in place and your breasts will look a lot larger.

Bandaeaus usually have molded cups or foam insets to keep everything in place.

Oh, good to know.

What works for me is to buy a pack of diapers and fill two with water, let them drain a bit. Then either put the whole diaper into a lunch bag or remove the silica and place that in the bag to get the desired weight. What I found with balloons is when they bust it's a disaster, but if you have a leak with silica it's minor. Just put the form in a second bag. I usually have 3 sets of different weights/sizes. But 50% time now I prefer the feel of the bra on my man boobs  44D.  The last bras I bought were 3 of this in black, white and red. They fitted very snugly, but the wire poked through on one side on the red after a short while, also slight difference in band size, but what do expect from a cheap product.  time. https://s.click.aliexpress.com/e/_on4s3OV