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I’ve figured out a lightweight solution for inflating my Ultralight boat which has the red PVC valves. I use my new-style winglock valve Thermarest inflation bag. A short peice of 0.875″ OD vinyl tubing from the hardware store connects perfectly into the Thermarest bag and then needs a few wraps of tape on the other end to fit the packraft valve.
Total weight is 12 g for the tubing and 54 g for the Thermarest sack, the latter of which I am carrying anyway to inflate my mattress. By comparison my pillow-case sized inflation bag from the fabric in the boat kit is 125 g which seems way too heavy considering the whole boat is only 800 g.
It takes quite a few bags (80 or more) to fill the boat up so not something you’d want to do multiple times per day. But for a trip where you are infrequently using the boat for river crossings and such I think it’s a good solution.
Option B would be to adapt the packraft inflation bag to inflate the Thermarest.
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