A good tripod is a long-term investment, so a decent bag is another essential, especially if you use it on location. Kevin Carter takes a closer look at two bags made for Gitzo tripods. What does it fit? I own both the Gitzo GC5101 and GC4101, which are designed for Gitzo’s Systematic range of tripods. While there’s only around 8cm (3.1 in) or so in length between them internally, the GC5101 is much larger in terms of internal volume and was designed presumably for the Geant (Giant) model 5-series Systematic that still measures some 73cm (35 in) even when collapsed and some 3-section 3/4 and 5-series extra-long XLS models. Sadly,…