I just tried this last year, after seeing something about it on here. Just happened to see some plants with open pods when checking cameras one day (probably Septemberish), and took a couple pods worth. Stuffed them in a tiny Ziploc baggie that just happened to be in the truck. I've also seen/read people use a 35mm film canister with a hole in the lid as well (possibly harder to find than a chew can these days). Or just rubber band the pod and use as the holder. I did like how you could see it floating longer than powder.