you can use little paper bags and good old fashioned camera roll black tubes. One has to asume that you have a scarce supply of seeds and intend to pollinate at will or that a very good seed turned out male and wisely you wanna be able to use it to better a breed or at least not to degrade it. Kuddos if thats the case. To use it you can flip the plastic tube over a bud or over the whole plant if you want a lot of seed. Or you can jam the bud inside the paper bag and tie the mouth of the bag to the stem. that way you only get seed on one bud and the rest of the plant is smoking material. Hope it helps.