I had a dry sac with a few small pin holes and decided to make my own Schnozzle pump, as sold by Exped.
Having just got a replacement Exped Syn mat, didn’t want my new one to get any moisture inside. My other one had popped some seams and acquired new bulges. Very uncomfortable. I never liked the moisture it accumulated, and it was a chore to blow up, especially on last years Northern India high altitude ride.
I had plenty of spare garden fittings and an hour later had successfully made my own.
Easy to use and even though it doesn’t have a plug, can always use it at the end of the day to put bread and other loose groceries.