MilkyMamaBear No Leaking - I love these bags! I have tried several different bags on the market . I’ve noticed that other brands at least 3-4 bags will leak and it’s usually in the bottom corners. I bought the 50ct and I didn’t have NOT one bag leak. They are the thickest bags I’ve came across and zip up very strong. Due to the fact that they zip up strong, I’ve noticed my milk looks more fresh once thawed out , color is spot on compared to other bags. I am not able to directly breastfeed, I Exclusively Pump and I have a large oversupply so bags are very important to me as I need to be able to store my milk. I highly recommend these bags!!!