I swapped the enormous 85g Pirelli RoadTUBE butyl inner tubes that held me back for so long with a pair of minuscule 35g P Zero SmarTUBE TPU tubes because I am SmarT
I mean, come on, that's 200g saved across 2 tubes and 2 spares.
People pay good money to save a hundred grams on a set of wheels! I've always said, if you're into weightweenism (mea culpa, but recovering) the cheapest way to get towards whatever low weight goal you have is to buy lightweight tires and tubes. Aside from weight, the better, lighter tires and tubes often give a better ride.