This is correct! Satchets are good to go.
Make sure you wipe them down with alchohol. I found it best to NOT cut off a corner to put needle in. Just stick a 1 1/2in 20 guage needle through one corner of the satchet. Then turn so needle goes alongside the inside of the satchet to the bottom corner of the same side you inserted in. Turn satchet so all liquid is in the corner where the tip of the needle is. Then start pulling the plunger. The tightness of inserting and not cutting off a corner creates a suction inside the satchet, you will get over 5ml quick and easy. This also doesnt expose the gear to air. Have a partner help hold to get it right. Then transfer into sterile vial.