These small bags perfectly conviennet me to store my milk in the freezer, they open easily big enough to decant breast pump to the bag and knew bag bibi. The capacity of information is not super super accurate, but you must normally have more specific on your breast pump, and after just note the ml, and the date "collection" on the bag in the appropriate place . Practical: a normal pen writes well and does not sink in plastic, not need a special pen to write on as regular freezer bags -after I bought the 1st prize, as it is to serve Once again, then maybe on more expensive can also write to normal pen without writing our scallops ...?! :-) I have not tested conservation pots so I can not compare but I did not want to try because these small bags are fine for me. I was asked me to waste it like (compared to the pots washed, but I saw some pots that use only a dozen times, then he must lay the c 'bcp is bigger than a bag), but since I give bibi very occasionally (medical appointment, exit ... once a week on average), the impact is not huge, I bcp of Greater efforts elsewhere! So I recommend +++ and delivery and the product status on arrival, always nickel, I never had any problems with Amazon since the time I order!