Well I never buy so little weed that I end up smoking it all in one day so I probably wouldn't grind ALL my weed up. I'm guessing if you kept your ground up weed in a glass jar it really wouldn't be much of a problem since even when there's no crumbs left you could take your finger and rub against the surface of the jar and smoke the kief, unless you accidentally dropped the jar and all your crumbs went flying every where and you're sitting there trying to collect all the kief and shake that spilled rather than picking up the solid bud mass and tossing it back in the jar. Don't ignore that, I never thought my bud would spill either but one day...it did. Luckily for me I didn't have the habit of grinding it all up lol.