So I was packing my Golite Ultra20 into my car today and realized there was a small hole about pinky think in the liner letting down leak out.

I want to patch this up. What is the best way to patch up a hole like this? I can't really pass a needle through because I obviously can reach into the baffles to turn the needle around.

I have a trip planned for this weekend, so any help is appreciated.

Get a 1.5" x 1.5" or so piece of silnylon, smear a little silicon around the outside and press the patch on.

Or, pinch the fabric over and run the stiching on the outside. Less attractive but lighter... Make sure the raw edge of the fabric stays inside the sleeping bag otherwise it will start to frey.