We have a small trash bucket next to our changing table and this is where we put used diapers. We usually will flush solids down the toilet before we throw the diaper in the trash can.
I've noticed that for some reason, the urine/smell/etc. escapes the diaper, to the bag, and through the bag to the garbage can. I can't visibly see any moisture or feel it on the outside of the diaper or the plastic bag lining the garbage can.
How is the scent being transferred to the can?