I have heard of using these glass bottles to store EBM. Was wondering, with the new kinds of lids it comes with these days, can we close the lids tightly when we use it to store EBM? Any chances of the EBM spilling or getting contaminated? Anyone who has used or is using can advise? I have so many such bottles and if i can use them to store EBM successfully it will be so convienent. Cos can store them in small qtys, less wastage.