Grenade blanks sealed packed

When I was reading the topic about Vacuum packing cartridges,I thought about a new topic about cartridges how are sealed.
Why are most boxes with grenade blank’s are sealed packed ???

this box 7,62x51 LOT 1-RA-70

RA = Raufoss Ammunisjonsfabrikker,Raufoss,Norway

headstamp Nato symbol 3-RA-70

I have also this sealed Swiss grenade blank 7,5x55

Gyrojet

Those are not vacuum packed, just in cheap polythene bags. Vacuum packing sucks all of the air out and the bag collapses.

gravelbelly

ok thanks for the correction gravelbelly

gyrojet

Gyrojet, could you tell the hs of those Swiss 7.5mm?

EOD

headstamp is T 00

Thank you Gyrojet! :)