1:Do these fit the diaper genie and do they help with the smell?
Yes they do fit, it is actually small enough to fit. It helps with smell a lot. I even put them in my trash buckets before putting the trash bag on and it works.

2:how long do they last?
Our filters last between 15 and 25 days, however you can place them in the sun after every 12-15 days, to “recharge” the filters and enable them to be used for about 2-3 months each. Recharging takes about 2-3 hours on each side of the sachets, but recharge time may be more or less depending on the strength and visibility of the sun’s rays.

3:Do I have to put these in a bag or just place them anywhere as it is when i take them out its packaging?
They are small pouches you can put anywhere. I threw one on the bottom of my diaper pail and taped another to the lid…work great!
I placed mine in the top of my diaper genie. Where it came with its own filter. Each filter is individually packaged and vacuum sealed, because of this, we guarantee our filters are made to withstand dampness, which in turn ensures that our product arrives in perfect condition to your door step

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