Make an Awesome Case-less Flash Drive, Did I Mention That It's Water Proof?




Learn how to use some commonly available materials that you probably have around the house to make an awesome case-less flash drive.

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Step 1: Gather Materials

You will first gather your materials that you will need to make the flash drive,

You will need tape,



Two cups,

A small DISPOSABLE paint brush,

A plate,

And a tooth pick.

A dremel can also come in handy.

Step 2: Cut Holes in Cups

Now you will cut small holes in the bottom of your cups and set them up as shown...

Be sure to tape the cups down about a plates diameter apart, Though you might wait to tape them down until after the next step...

Step 3: Thread the String Through the Cups

Now thread the string through the holes in the cups and tape the string down as shown...

Notice the plate? You will be needing a few so now would be a great time to go get them,

I'l wait...

Step 4: Time to Open the Flash Drive Up...

It is time to CAREFULLY pry opened your flash drive,

Take care not to break circuit board inside....

Step 5: Put Some Wire Through Usb Connecter on Flash Drive (To Hang It Up)

Now you will need to put some wire onto the flash drive so that it can hang up to dry later...

If your flash drive does not have holes, Then you can skip this step.

Step 6: Time to Mix the Epoxy

Now mix your epoxy on a plate (disposable plate !!!!), most epoxies use a 1:1 ratio of resin and setter (For a lack of a better word).

Remember to always use gloves and safety glasses while using any chemicals (Epoxy included).

Step 7: Brush Epoxy CAREFULLY Onto Flash Drive

Now use your brush to brush the epoxy onto the flash drive,

Be very careful not to get epoxy on the USB connecter...

Step 8: Hang It to Dry

Now it is finally time to hang your flash drive up to dry,

hang it up using a clip...

If your flash drive doesn't have holes just clip it up using the usb connector...

Step 9: Wait for It to Cure...

Wait for the epoxy to fully cure...

Step 10: Take Off the Annoying Drop of Epoxy...

Now take a file or some diagonal cutters and just take off any excess resin...

Step 11: Test It Out...

Now test and make sure that you didn't ruin your flash drive, then let sit in a cup of water, dry it off, and re-test it to prove that your flash drive relay is water proof...

I have mine back in its case, (I have no idea why.)

Step 12: Other Things to Do With Your Awesome Flash Drive...

You don't have to put the flash drive back in it's original packaging you can now find new and even greater ways to show off your piece of water proof technology. (or you could not put the flash drive in any case at all and show off your cool case-less flash drive.(the epoxy will protect it from most dangers a flash drive must face, but try not to bend or step on it !!!!!)

Also consider encrypting it with some free software like true-crypt available at

Step 13: Please Leave Me Some Comments...

If you liked this instructable please leave me a comment.
If not please tell me how to make it better or more clear.

Thank you,

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    110 Discussions


    11 months ago

    Can you purchase a USB without any case ? if so where from ?


    3 years ago

    i'm going to teardown my flash drive today. :)


    3 years ago

    Use a non-electrically conductive thermal casting epoxy. Higher performance flash drives last longer when they can dissipate heat from the NAND and microcontroller better. Something that is overlooked inmost all USB flash drives available.

    Also be aware that no data recovery services will help you once you've done this to a flash drive.


    6 years ago

    Let me ask a question. Why are we using a flash drive underwater?


    6 years ago

    I thought if the USB thingy that went into the computer got wet it would break


    6 years ago on Introduction

    very nice, it think clear caulking will work too. no need for it to be water proof.


    11 years ago on Step 13

    I think it is a cool. At my local BestBuy they have this super water proof drive that i think is also the same idea but this seems cheaper! The one I saw was $60.00 for 4GB

    4 replies

    Reply 10 years ago on Introduction

    for me, a 2GB waterproof flash drive cost about $12 ( $11 for the flash drive and $1 for the superglue.)


    Reply 7 years ago on Step 13

    well I know because I have put superglue on other things that will go into water, the glue will eventualy wear off. And the super glue that i use says on the back of the package that it is not recommended for use in wet locations, but your superglue may be diff. I know that you can buy waterproof superglue from automotive stores but its almost twice as much as regular super glue in my town anyways


    8 years ago on Introduction

    No it won't.
    I have drives that have been epoxied since 2003 that still work normal.
    EPOXY is harmless to a flash drive.


    8 years ago on Introduction

    You said you couldnt find a word, so heres a free one.
    Instead of setter, catalyst. Hope it helps!


    9 years ago on Introduction

    Its better if you place the entire thing back in the case it came in, essentially expoxy it into its case, its a far stronger solid unit. I suggest epoxy putty would also be an option, you can mold it into any shape as well for a bonus, but an underlyinglayer of liquid epoxy is probably a good idea for water seal.

    really?! that sucks! i mean how could you tell i mean could you see that it dissolved the soldered connection? and i should use the normal everyday silicone in the tube? have you tried this? ill probably go with the silicone. also. what about acrylic? im sure they make acrylic resin that will harden when dry

    will it really?! how do you know this? because i really want to do this to my flash drives. but i dont want to mess them up. can you supply a source?


    9 years ago on Introduction

    Why wouldnt it still work if you just left it in water without epoxy?


    9 years ago on Step 11

    if it is tranferring means its working...