Make Your Own Gear

What terms should I be using when looking for a double-sided bag zipper that opens in the center? I found [this](https://ykkamericas.com/what-kind-of-two-way-zipper-do-i-need/) on ykk, the zipper with double sliders (head to head), but the search wasn't only what I was looking for. And if I build my own zipper what pieces do I need?

I recently acquired a ruck with a few holes and I’m looking to mend them. I found some basic instructions on hand sewing a bar tack to repair it, but I just want a reality check on how doable it is and any tips. If I really can’t do it, there are several local places I think can do the repair, but I’m a big believer in fixing my stuff, and I’ve got another pack that looks to be in need of a quick sew job as well. I’d describe my sewing skills as good at buttons, decent at straight stitches. Note: I have the “right” thread on the way.

Here's a tutorial for sewing a compression sack I made a while back - I hope it might be useful for anybody trying to make their own.