I used to carry a kit like that- even did a stint stacking trusses for a while. that was 20someodd years ago, and the state of the art in framing tools has changed somewhat, and I haven't seen the need to update mine in a while so the names have changed, but I suspect the designs haven't, much.
I went through a few sets of toolbelts, settled on a high-end one the name of which escapes me now- I haven't seen it in a while. I have a lightweight cotton apron with a couple of pockets that I use when I need to move around with some fasteners and a tool or two, which does happen occasionally. if I'm going to do any amount of actual framing work, which will be happening here when I start building the new shop in a month or so, I'll wear an old leather 3pocket bag that I inherited somehow. it's nothing fancy, and I'll never load it up with much, but it'll let me climb up into the rafters with a load of clavos and a rock-on-a-stick to put stuff together.
funny now to look back at taking so much pride in framing tools, but I sure did.