It's very easy to drink from your hydration pack while still wearing the Wolfsnouttm. Simply use the tip of the
drinking tube to push the face seal over to the side while inserting the tip in your mouth. When your done
drinking use the tip of the drinking tube to pull the face seal back into place. A little practice and this is  
very simple.
Drinking With Your Wolfsnouttm Still In Place
Modifying Your Wolfsnouttm For Riding with a drinking tube in your mouth at all times
Using a pair of scissors make a small cut about 3/8" wide  all the way though
about here or on the other side depending on which side you prefer.
Patent pending
If you would like just ask when you order and I will cut the hole for you
Using a pair of scissors make a small cut in the side of filter even with the front side of the circle
strut about 3/8" wide. Insert the drinking tube into the hole and fit the Wolfsnout in the front of your
helmet and adjust accordingly. If you do not cut the hole too large the filter will seal around the
tube. If you remove the tube it will not change  the effectiveness of the filter the hole will usually flex
shut.., but your Wolfsnouttm may not last as long.