This tip will help you protect your spare tubes. Follow my tip and you won’t have to suffer the problem I did, many years ago. I was in a long mountain bike Enduro event and I got a flat tire.
I found both my unprotected tubes, carried in my under-saddle bag, had suffered abrasions due to months of jiggling around in the bag. Holes had worn in the corner folds of both tubes, rendering them totally useless. Luckily, I was able to “borrow” a tube, and that saved miles of hiking.
My solution is this: Set one of your old cycling socks aside. Totally deflate two tubes and roll them tightly. Make sure you install the valve cap so that the Presta screw isn’t able to wear a hole in the tube. Fasten the tubes with rubber bands.
Insert one tube into the sock, pushing it down as far as it can go into the toe. Twist the sock and insert the 2nd tube. Twist the sock again, after the 2nd tube, and fold one tube onto the of the other — retaining the separation twist.
Fold the top of the sock back over the tubes to create a compact package.
You now have total tube protection, an emergency rag for dirty jobs that fits nicely over your hand, and – if you’re real in dire need – emergency T.P.! (Don’t think I need to expand on that one!)