Step 16: Trim out whole pouch body and round corners

After spending hours of constructing, this is perhaps the most nerve-wracking step. Using a metal straight edge with a cork bottom and a brand new #11 xacto blade will help.

a. Close the pouch together so that the Velcro, plates and outer seams are aligned. Check alignment again! Lay the closed pouch on your cutting surface and along one long edge, and align your straight edge 1/8 (.32) away from the outer seam. Give yourself a little bit more room if your stitching is not very straight or consistent to avoid cutting into the outer double seam.

b. Apply very firm pressure to the straight edge and with a slow firm cut, slice off the excess, cutting through all the layers at once. (You may have to do this in a couple cuts.) Repeat for the other side. Do the same for the short, bottom edge by the Velcro.

c. Cutting through both sides at once, round the corners. You can get away with cutting one corner at a time if you wish.
<p>great </p>
<p>very nice</p>
<p>nice pouch </p>
<p>Hrmm...what happens if one closely surrounds the RFID chip with some shielding, THEN with more RFID chips? I'll need to try this. Hope others will, too. Getting the data from a single chip inside a pile of chips should create a challenge for a chip reader. I can't be the first one to have thought of this. Another idea: tap the antennae of the surrounding RFID's and add some more antenna surface to each, so they present stronger signals than the one you're concealing? If I were building a reader, I'd have it looking for the strongest signal. This would (maybe) leave the signal of the chip that's being protected look like background noise?</p>
<p>nice ideA</p>
<p>Nice work</p>
<p>awesome i like it</p>
<p>Wow! This is one of the best I'bles I've ever seen. It is well-documented, well-researched, well-thought-out, well-implemented, and well-tested. Brilliant! A model of how all I'bles SHOULD be, but aren't. Kudos to you!</p><p>You deserve at least a free one-year PRO membership if you haven't received one already.</p>
Thank you! &amp; no, I haven't received any free stuff from Instructables for my efforts.
<p>Well you should. I'd recommend you but I'm just a peon around here. I did get a couple years' worth of PRO membership free for my stuff. I think it is based on how many views and favorites and if a staff person happens to see and like your stuff.</p>
I'm almost too busy making things to also be making instructables.
<p>I know the feeling. I probably publish about 1% of my personal projects here. It takes a lot of time to photograph and document a procedure and list materials and so forth. And I won't half-ass it like some people do. I believe in quality, not quantity, like you.</p>
That is way cool. I just bought a cool RFID jamming device that is the size of a credit card called Armourcard, I got one for my wife and I as my wife got skimmed recently. We haven't had any skimming since. They are an ozy invention. <a href="http://www.armourcard.com.au" rel="nofollow">http://www.armourcard.com.au</a>
Okay, WAAAAY back when you posted this or something I said I was going to make this pouch out of fabric, and you said, &quot;great, I'd like to see it!&quot; <br><br>Well...I think it's been 2 years maybe? I FINALLY actually did it, even though the metal pieces have been cut this whole two years. So here is my interpretation:<br><br>
Also? I didn't add a strap, but made the spine wide enough that should I choose to add the strap later, I can. I'm also thinking of adding some velcro or something as a clasp. I wish I were tutorially gifted so I could render my interpretation into a tute for folks who want to sew these, but honestly, I'm not entirely sure how I made this happen. sometimes I get the sewing machine out and magic happens. Mostly because I have other people's directions that I can somehow make into my own interpretation. <br><br>Also? I love the goggles in your profile pic. Shiny!
I love the batik. It looks so much nicer than melted plastic. And less stinky too! <br>yay, someone made my pouch! <br><br>I'd love to hear how it works after you're out and about.<br>Thanks for posting. what a treat :-)
This has made my day!
Great Instructable. I learned something I should've known already, I love that!
Can I make a wall poster of &quot;Enthusiastic lab helper?&quot;
She's cute. ;X
Nice instructable and a good looking finish on the final product. But after much scrolling back and forth and opening all the photos, I'm seeing too many &quot;holes&quot; that have doubt the effectiveness of it, particularly with systems that use higher frequencies.. No full metal boxes around the card pockets no shielding at where the pouch folds over. I would at least fold the aluminum around a credit card and crimped the edges or use metal screening between the outer and inner pooch materials.
Could you use old potato chip bag material? I was at a CERT conference once where an FBI agent said that they store suspect phones and electronic RF devices in potato chip bags because the signals cannot escape the bag. Just wondering if that was true or not.
Some chips bags are Mylar that are aluminized on the inside. So they should work as RF shielding.
good question!<br/><br/>potato chip bags are made of mylar &#8212; one of the materials tested during the prototype stage. mylar was found to attenuate cell phone signals, but the frequencies for RFID are lower and the tests i did showed the mylar had little effect. the lowest possible cell phone signal tested was 900MHz (using the phones of friends, etc--american phones.) the goal was to block the most common frequency used for RFID tags = 13.56MHz. the mylar had unmeasurable/unnoticable effect on those tags and the even lower frequency tags of 125-130KHz like the kind used for pet ID chips. the lower frequencies are tricky. they can penetrate metal, water and even kittens---then again they operate in the &quot;near field&quot; = 1 meter or less.<br/><br/>to answer whether that FBI agent was speaking the truth is tricky. it is very possible that sticking a cel phone in a potato chip bag will attenuate the receiving and emitting signals enough so that it doesn't work. as for &quot;other RF devices&quot;, it will depend totally on what frequency the device is operating on.<br/>
Thanks for the information. I had wondered if the frequency would make a difference in results.
Though it's a bit less likely than someone gathering RFID information, I think it's worth noting that this bag should also protect complex electronics(anything with a circuit board. Cell phones, laptops, etc.) from an EMP. (Electromagnetic Pulse)
It'll also stop most cellphones from getting reception, thus going into 'seek' mode and ending up with a dead battery.
Sweet. I won't be making one, as I really don't have the need, but I'm glad I read it. =D And your knowledge of radio signals is pretty impressive...5 Stars
You might want to put a copy of the Bill of Rights in your bag, just in case. They have one printed on sheet metal for $4. It's guaranteed to set off the metal detectors at the airport.<br /> <br /> I got mine at the Penn &amp;&nbsp;Teller store at the Rio in Las Vegas, but there are other sources around.<br /> <br /> here's a cute article (scroll down a bit):<br /> http://securityedition.com/category/good-news/<br /> <br /> <br />
What about an altoids tin? Would that work for shielding credit cards? Also what about using thin pieces of lead foil instead of sheet aluminum? Does that block the scanner? I have a bunch saved from the tops of wine bottles, from years ago when they used lead for that. They are more flexible than aluminum and won't even break the needle, I think it would go right through them since a steel needle is much harder than (thin) lead.
I haven't tried an altoids tin yet. I say try it if you have any kind of ID badge or chipped card. Lead should work great too -- pretty heavy though.
To add some additional information to this thread, the following was taken verbatim from Wikipedia. Bracketed numbers are supporting data reference numbers.<br/><strike></strike>~<br/>Shielding<br/><br/>A number of products are available on the market in the US that will allow a concerned carrier of RFID-enabled cards or passports to shield their data. In fact the United States government requires their new employee ID cards to be delivered with an approved shielding sleeve or holder[citation needed]. There are contradicting opinions as to whether aluminum can prevent reading of RFID chips. Some people claim that aluminum shielding, essentially creating a Faraday cage, does work.[59] Others claim that simply wrapping an RFID card in aluminum foil, only makes transmission more difficult, yet is not completely effective at preventing it.[60]<br/><br/>Shielding is again a function of the frequency being used. Low-frequency tags, like those used in implantable devices for humans and pets, are relatively resistant to shielding, though thick metal foil will prevent most reads. High frequency tags (13.56 MHz &acirc;&euro;&rdquo; smart cards and access badges) are more sensitive to shielding and are difficult to read when within a few centimetres of a metal surface. UHF tags (pallets and cartons) are very difficult to read when placed within a few millimetres of a metal surface, although their read range is actually increased when they are spaced 2&acirc;&euro;&ldquo;4 cm from a metal due to positive reinforcement of the reflected wave and the incident wave at the tag. UHF tags can be successfully shielded from most reads by being placed within an anti-static plastic bag.<br/><strike></strike>~<br/>Researchers at two security conferences have demonstrated that passive UHF RFID tags, not of the HF type used in US passports, normally read at ranges of up to 30 feet, can be read at ranges of 50 to 69 feet using suitable equipment.[64][6<br/><strike></strike>~<br/>The potential for privacy violations with RFID was demonstrated by its use in a pilot program by the Gillette Company, which conducted a &quot;smart shelf&quot; test at a Tesco in Cambridge, England. They automatically photographed shoppers taking RFID-tagged safety razors off the shelf, to see if the technology could be used to deter shoplifting. This trial resulted in consumer boycott against Gillette and Tesco. In another incident, uncovered by the Chicago Sun-Times, shelves in a Wal-Mart in Broken Arrow, Oklahoma, were equipped with readers to track the Max Factor Lipfinity lipstick containers stacked on them. Webcam images of the shelves were viewed 750 miles (1200 km) away by Procter &amp; Gamble researchers in Cincinnati, Ohio, who could tell when lipsticks were removed from the shelves and observe the shoppers in action.[citation needed]<br/><strike></strike>~<br/><br/>Since the above information are only segments it might be said by some that they are out of context, so if you wish to read the other surrounding information, please go to:<br/><a rel="nofollow" href="http://en.wikipedia.org/wiki/Rfid">http://en.wikipedia.org/wiki/Rfid</a><br/>and read it all, including a huge number of references containing additional data.<br/><br/>BTW, great work on the research, construction, and testing!<br/>
Thanks so much for your Instructable. I am getting one of the new passports soon, and I have so say that I am not thrilled about it. You said that you explored some of the conductive textiles as well as some of the passport sleeves online. Do you have more details about that? Was the tin can approach not enough for the passport? or did you just want something sturdier? I have a BS in physics, so I know about the science, but I don't have access to any of the equipment necessary to do the testing, I would be really interested in more of the details of your tests. I was thinking about ordering some of the fabric from <a rel="nofollow" href="http://www.lessemf.com/fabric.html,">http://www.lessemf.com/fabric.html,</a> and just making a crafty little pouch, but I would prefer on that actually works... Do you know the frequency of the passport signal? <br/>
Anyone know if airport security will freak out if this is your bags?
See pg. 21 for an updates on traveling and dealing with security.
You should have no problems with Security.. As long as you put it in the little trays that go through the X-Ray. They'll probably freak out and want to look through it, though, when it turns up as metal to their machine. Oh well.
i'll be experimenting with that this weekend. i have a few friends who have traveled with one already and haven't heard anything negative yet.
I'm really impressed with the attention to detail put into this instructable. I think you've raised the bar with this. Well done!
I'm wondering how important the plastic is to security? I mean, can I use fabric instead and still be protected? I'm not keen on melting plastic, but I want the bag to be secure. Thanks!
The fused plastic is a way to get a funky, durable material, and an opportunity for recycling (or some people call 'upcycle') The amount and arrangement of aluminum is what makes it shielded. You could use fabric. I want to see a pic! :-D
Hehe, I can't help but notice the table in step 21 photo. Nice.

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