I often use cilogear worksark 45L for mountaineering in China. I like this pack. It is light and multi-function. Strap set very good for use. But D-lock is made by iron so it is too heavy, about 8g each. They are 16 pieces on a bag, plus those on strap set ........over 150g. So I bought some Linal 25mm metal slide in MEC. That is only 3g each.I replace D-lock by them.I made for a long time because I dont have good tool. Now it is less than 2g each. Although it seems easier to fall, it does not. They are lighter and good for use with gloves.