Well, maybe more like a three-quarter-way-through-the-series recap, because that's how far we've come. Although all we've done is only How To Put In A Zipper To Close A Pouch. Nothing truly fun, as far as what zippers can do in a bag. However, I know that many of us are still new to zippers, so I chose to spend extra time on those intro chapters and introduce you to as many different ways of Opening A Pouch/Bag as was reasonable . Two reasons:
- so everyone could have lots of practice doing the basic stuff and get really good at it, and
- to visualize that there are really just a few main principles and base designs for pouches and bags, and most bags are just different manifestations of those concepts, or variations on those designs.
(But, really, I've just been dying to get to these next few chapters, because - FINALLY - this is where the fun begins.)
Before we do, however, here's a quick recap on where we've been.
We learned some ways in which zippers can be used to open and close bags and pouches, including flat central openings;
openings along edges - in which the zipper pull remains within the (limited) dimensions of the opening,
with both centrally-installed zippers,
and zippers whose zipper tape itself formed the "gusset".
We also looked at how zippers can be used to open up the base of a container for flat storage,
and how they can split straps.
And we discussed the use of seam binding - both external
and internal -
to finish zippered pouches whose lining and outers we wanted to keep together as a single, composite layer rather than constructing them as separate layers.
Finally, we looked at two other ways to install a zipper - in-seam
Now that you're able to install a zipper in any opening in any bag or pouch, it's time to move on!
In the next few posts, we'll be exploring how to use a zipper to change the shape and volume of a bag. We've already dabbled in a little bit of that when we made those collapsible bins and bags here and here. Let's talk about the principle behind this.
Up to this point, we've installed a zipper on either side of an opening. In this role, it simply closes the opening. On the surface, you see a straight line of zipper coils; underneath that is the hollow interior of the pouch or bag.
Here comes the principle:
If, instead of a gaping opening, you insert a zipper between layers, you can enclose one of those layers inside the other when you close the zipper.
For instance, in the flat case below, we've added a lining layer, and inserted the zipper between those layers.
When the case is zipped up, it encloses the lining inside the outer.
Sometimes, enclosing one of those layers also requires compressing it, because that layer is very big. In the example below, the entire flat lining is replaced by the walls of a tote bag. When this case is zipped up, it compresses the tote bag inside.
We'll be looking at six examples of this principle, and each one orientates that layer differently. All of these six examples, however, have one thing in common: because it is installed between layers, the zipper compresses something when it is zipped up, and that "something" folds like a pleat. I've shaded them green in the diagram below - see if you can visualize each of those pleats in action when the zipper (in purple) opens and closes.