Having chosen the Advent brand for the breast pump, these conservation pots fully meet my expectations, I install them directly on the breast pump, mark the date in erasable marker, place them in the freezer or refrigerator to heat bottle warmer and adjust the nipple "natural" above. In short these pots avoid decanting, wash, sterilize ... constantly, it's bad enough taking a breastfeeding! These are the same as those pots come with the breast pump I use for 3 months and I have not had a problem with the plugs close if we pay attention to screw straight, they are dishwasher dishwasher, fell to the ground ... they are good quality! For graduations, I advise you to accentuate in permanent marker when empty, once full, it's a little hard to read but you quickly get used to and we know "to the eye" when we is. This lot contains 10 jars with lids and two adapters for nipples or breast milk, which is very convenient to express milk at work while baby takes her bottle in nanny. For the bottle warmer, these pots are a little wider than conventional bottles, but I have a bottle warmer another brand and take it without problem (even in the car), probably because mine are designed to adapt to small pots of trade (which are approximately the same size), so check before buying the bottle warmer ... This set of pots perfectly suitable for my use, I highly recommend it to other parents.