How do you vacuum seal powders?

[neurotic3]

[font=verdana, arial, helvetica]I have found that people vacuum sealing powders often gives the advice of putting them in another bag with a little hole first, so that when you aspirate the air with the vacuum sealing machine the powders aren't aspirated. However, putting them in another bag first, even if that bag has a hole, I think it might work to your disadvantage in that some air might stay inside ... what do you think and what do you recommend?

thanks.[/font]

 

[DR.D]

you can do that, but its best just put in glass vials and then vacc'ed. Plastic bottles can collapse.