I'd trust this guy! ^^^^^I do it all the time, as long as they fit you are good. As the other fine folks stated extend the test time a bit.
Just put two in the bag. The directions say to test from 24 to 36 hours. So is the suggestion to test more than the 36 hours? Thanks for the quick responses.
It's been awhile for me, but I believe the test period is 12 to 24 hours. The Boveda calibration packs are good for 3 months, so does it really matter how many you can do at once?