winnie,
no problem. i also store more than 1 feed per pump in a single bag.
What i do is, i thaw about 3 bags at a time at night. Next morning, they will be thaw, then i transfer the milk from bags to bottles (based on per feed amount). I will use different bottles or label for thawed milk. Then i can monitor the consumption of thawed milk and will not mix them up with the fresh EBM... then i will know when to take another batch from freeze to thaw again.
This also save time when baby want to feed and will not garang gabok/ miscue and spill when we're transferring milk from bag to bottle in a panic state.
Just another note, the milk fats tend to stick onto the side of the milkbags, so try to rub against the side such that as much fats get back into the milk, the fats are the ones that keep baby full.