Depends what kind of sports bra..I wear sturdy supportive ones with adjustable broad straps that can be crossed over or not , depending what sits well under the backpack shoulder straps without rubbing. The fabric is wicking, the "weight distribution" feels comfortable and friction free , especially on the surgically affected side, scars don't rub and quite fast drying.They do up like normal bras without the narrow shoulder strap slippage I often get. They do not require shoulder dislocation while executing pretzel manoeuvres in a wet cubicle. Best of all these can do as a crop top and assist the modesty factor, e.g. Panache , or Bendon extreme out. If you can get away with less, go for it! I tried one of the Icebreaker merino bras and a" travel bra" and my hoots of laughter could be heard clear into the next block.