28g of which is most is the 25mm buckle :( Although will be able to unclip easily with cold wet hands, looking at positives here. The pic has 7x25mm folds before buckling, girth is 120mm. As a note on weight, Alpkit Airlok Xtra in 3l is listed at 86g, using smaller buckle, and being shorter and fatter.
Total volume is about 3l, designed to hold pretty much any shelter setup I feel like carrying bar a complete Laser Comp.