Gu pots and pringle lids.
This is a technique tip only for those who have a resident teenager.
Plastic Pringle box lids fit perfectly onto Gu pots. Snap! Sterilisable, re-usable, airtight seed soaking/stratifying jar. Stands up to boiling water well, does fine in the fridge and microwave too. You can write on the plastic lids with a waterproof pen, or on the side of the jar, to rub off when you've finished. Sorted.
Remember to rinse and aerate them twice a day with cooled boiled water to keep them fresh - the seeds I mean, not the teenagers