Unfortunately I can't get completely miffed about it because I love a couple of flavors of capri sun. Plus it's handy as heck to pop them in the freezer then pop them in my lunch box cooler. They serve a dual purpose here. They keep things cool in the lunchbox cooler, and by the time lunch is around they have thawed out.
The other thing I love about these things is all the cool things I've seen people make with them. Wallets, purses, bags, you name it. Just do a google search for "capri sun projects" or "DIY capri sun". You'll see what I mean
I have a bit higher aspirations than that. I want to try making an umbrella or a tent out of them. But the tent might be a bit ambitious. Most people sew them together with thread, fishing line, or upholstery thread. Or they will tape them together with Duct Tape or Gorilla Tape. I wanted to weld them together.
At first I looked into how they do it industrially. Apparently they either use microwaves or ultrasonic welding. Do-able, but not for everyone. Certainly not with parts I had laying around the house, and certainly not cheap.
In the end I found a soldering iron or wood burner works like a charm.