I haven't used laminated fabric, but I have used heavy loined vinyl (car stuff) to make my husband tool pouches. That may have some of the same issues. I found it worked a lot better with a teflon foot and being very careful to ease up on the presser foot pressure.

Kay

Thanks Kay! I'll be sure to watch the tension and if I have problems I'll check that first.

I can't help you with fabric choices, but McCall's has a backpack pattern (in with a tote pattern) and Jinny Beyer has a pattern that's real cute, though intended for use with her border prints.

I'm pretty sure Simplicity has a backpack pattern as well.

I can help you with fabric! My advice - look at Marine fabric - not oil cloth, laminates, or vinyls.
You have many choice living in sunny Florida. Sunbrella treated is a viable choice - maybe the best known - Teresa can help out with more info.
Surlast is a another very good choice - waterproof - not difficult to sew. You will need to use a heavier needle and thread.
I've posted a link below for a very good source and more available information and education than you probably want. No affiliation to the company, other than a very satisfied customer. You don't need their machine for what you want to do. You are opening up a new world of sewing.

Here is a link that might be useful: Sailrite

Thanks Marsha! I've used Sunbrella fabrics for many things - you can hardly live in Florida without it! - but hadn't considered it for the backpack. I'm kind of enchanted with the glossy laminates right now, but if this doesn't work for me I'll go back to Sunbrella and I'll check out Sailrite too.

I'm afraid I don't have a suggestion for a backpack pattern but Seattle Fabrics, Inc. has great fabric selection for backpacks and other outdoor use. Check out the coated and uncoated nylons and polyesters.

Here is a link that might be useful: Seattle Fabrics, Inc.

Oh my goodness, I don't know how to sew clothes, but after looking at the Seattle Fabrics website I really want to learn!

The Seattle Fabrics site was great fun! I just placed an order and can hardly wait for it to arrive!

Ran across this pattern (free) somewhere the other day, and remembered you were looking for an adult backpack. It is really cute and while I don't use a backpack either, this one looks like something I might make when I have some free time.

Murphy

Here is a link that might be useful: http://blog.fabshophop.com/blog/?p=1244

Murphy, it was the Chloe bag that first inspired me to take on this project! It is a cute bag and although I'm not going to piece strips, this is the general size and shape I want the finished bag to be. I couldn't remember where I saw it so I'm glad you posted the link. Thanks!

I received my fabric order yesterday and was surprised to find that the vinyl oil cloth is very soft and may work great. It's thinner and more flexible than I expected it to be. The laminated cotton has a nicer feel but I think both will work.

Kate