PlacidWaters
Adventurer
I always close the deflation valve before proceeding to step two. Then roll the mat until the "air bubble" forms. Kneel on the mat, reopen the valve and finish the roll. Replace valve again. The time saved is worth the extra step for me.
I see your point. I guess you're saying it's okay to remove the check valve if you close the valve after step 1.
BUT: If you remove the check valve you won't be able to adjust the firmness while lying on the mattress because the air will rush out.
On a related topic, neither of the check valves works on my mattress. That means that the included hand pump doesn't work for the last "breaths" because the pressure of the air in the mattress is greater than the pressure provided by the pump. I have to top off the mattress by mouth. I think Exped has some quality control problems with the valves. I haven't returned the mattress because it's a hassle.