Hartwerger -
Outer sleeves in my experience are typically larger and heavier gauge plastic "envelopes" that will accomodate the entire LP package...vinyl w/inner sleeve + jacket. I don't have these on all my LPs but where I do my practice using them with inner sleeves is to insert the Lp into the inner sleeve with the open end of the inner sleeve facing up or "North". Slide the inner sleeve into the record jacket (maintainng open end North) and then insert the record jacket open end first into the outer sleeve. The open end of the outer sleeve is at the spine end of the record jacket. The open end of the inner sleeve is pointed at the top of the inside of the record jacket. Dust (to anthropomorphize) trying to get in has to make a few 90 degree turns to get to the vinyl.
Outer sleeves in my experience are typically larger and heavier gauge plastic "envelopes" that will accomodate the entire LP package...vinyl w/inner sleeve + jacket. I don't have these on all my LPs but where I do my practice using them with inner sleeves is to insert the Lp into the inner sleeve with the open end of the inner sleeve facing up or "North". Slide the inner sleeve into the record jacket (maintainng open end North) and then insert the record jacket open end first into the outer sleeve. The open end of the outer sleeve is at the spine end of the record jacket. The open end of the inner sleeve is pointed at the top of the inside of the record jacket. Dust (to anthropomorphize) trying to get in has to make a few 90 degree turns to get to the vinyl.