Introduction: Bicycle Seat Condom

Picture of Bicycle Seat Condom

During the Fall semester I started riding my bike to school and learned I hated riding in the rain after a seven hour class. I dreaded the idea of riding in the rain with a wet bike seat causing me to stand while pedaling. Luckily, being surrounded by Low density polyethylene (LDPE) cutoffs in the studio I began experimenting with vacuum forming this material to create a reusable bicycle seat cover that is durable, flexible, and waterproof.

Step 1: Materials Needed

Picture of Materials Needed


1 Sheet of LDPE (Low density polyethylene) cut to designated size of a vacuum former
Here is a link on information about LDPE

2 Sets of Grommets

1 Bungee Cord

1 Marker (Erasable markers work the best

1 Vacuum Former
Here is a link to make a good, cheap, upgradeable sheet vacuum former

Scissors and Razor Blade

Step 2: Step 1: Retrieve Bike

Picture of Step 1: Retrieve Bike

Step 1: Retrieve your bike and bring it into a safe clean area.

Step 3: Step 2: Remove Bike Seat

Picture of Step 2: Remove Bike Seat

Step 2: Locate your bike seat and remove it from the seat post.

Step 4: Step 3: Find Vacuum Former

Picture of Step 3: Find Vacuum Former

Step 3: Locate a vacuum former and place the seat at a diagonal on the tray. The placement of the bike seat on the vacuum tray will help keep the seat from moving and displace the LDPE better.

Step 5: Step 4: Warm Vacuum Former

Picture of Step 4: Warm Vacuum Former

Step 4: Turn on the Vacuum former and allow it to warm up. REMEMBER to keep the bike seat tray down while the warming up to keep bike seat from melting.

Step 6: Step 5: Forming the LDPE

Picture of Step 5: Forming the LDPE

Step 5: When the LDPE is soft enough remove the heating component and raise the vacuum bed. REMEMBER to remove the heating component

Step 7: Step 6: Helpful Hint

Picture of Step 6: Helpful Hint

Step 6: Turn the vacuum on an off in short bursts to allow the LDPE to form around the seat without tearing. The LDPE is soft when warm which will may cause a hole from the force of the vacuum.

Step 8: Step 7: Marking

Picture of Step 7: Marking

Step 7: Allow the LDPE to cool and remove the tray. Draw a line around the seat with an erasable marker. (Hint: Erasable markers are the best)

Step 9: Step 8: Cutting and Attaching Grommets

Picture of Step 8: Cutting and Attaching Grommets

Step 8: Cut out the LDPE using scissors and a razor blade. I like to use small scissors at the end to cleanup my cuts. Draw marks in the center of the seat and attach the grommets. When grommets are attached hook your bungee cord to the grommets and give a slight pull to test for tearing.

Step 10: Congratulations

Picture of Congratulations

Congratulations! You have successfully made a Bike Seat Condom. Go outside and ride in the rain with your new creation.


mohammadk95 (author)2016-10-07

It took me a few seconds before i figure it out that giant seat doesn't belong to the next bicycle and its just a regular seat with a close up photo :DD

IDK if anyone understands me! :DD

berserk (author)2013-08-07

I did almost the same thing to protect my leather seat. I used styrene, because that was what was easily accessible. However, it doesn't last when cold: mine cracked when I used it in the winter. Who knows, maybe it was just ready to crack and temperature had nothing to do with it, but this is Winnipeg and it does get cold, and I ride through the winter. So, how is your cover holding up? Have you used it in cold weather? Maybe I just need to get myself some LDPE. Or if not that, anyone have suggestions for a good thermoformable winter plastic for this?

swell (author)2011-03-27

You know those plastic grocery bags? One of those and a rubber band. Also works when transporting bikes on the auto bike carrier. I keep one rubberbanded to the stem.

dumbluck13 (author)swell2011-08-30

I like to keep a neatly folded plastic bag wedged between the saddle & the rail. No need for a rubber band & its always there when I need it. I prefer the black bags, they're pretty much invisible since my saddle is black as well.

tchiseen (author)2009-03-18

Two alternatives to this 'solution': 1. Stick a hand-towel in your bag to wipe water off a wet seat. 2. Remove the seat from the bicycle when not in use. This also has the effect of deterring theft.

bad ass pope (author)tchiseen2010-06-22

Taking your seat off is a baad idea. You'll just get a load of rainwater and therefore rust inside your frame, which isn't cool, believe me.

Advar (author)bad ass pope2011-07-09

Remove seat, place balloon or condom over seat post.

santy22 (author)tchiseen2009-07-17

hmmmmm 1st option seconded for being very "Hitchhiker's guide"-ish

strods (author)santy222010-03-16

I third, motion carried.  everyone,  "Don't Panic"... oh and so long and thanks for all the fish

Advar (author)2011-07-09

Shower cap.

frogmeetcog (author)2010-07-18

Why not just use a few actual condoms, one over the other? Several people on youtube have stretched the things over their heads, so getting one over a bicycle seat shouldn't be a problem. Also, having a rubber on your bicycle that looks like it has been used for something nasty (which it will after a short ride) would be a great theft deterrant. Alternately, there exist waterproof neoprene covers that stretch over a seat rather like a condom does a male gizmo... I got mine for free at the seattle bikeswap, and it's kept my Brooks dry and happy ever since.

thebludshed (author)2009-03-23

Is it just me or did anyone else notice that this person talks about riding"in" the rain with a wet seat? I find it odd that they dont mind getting wet everywhere else from the rain but they need to have a dry butt. strange.

mysss (author)thebludshed2010-03-19

If you'd ever ridden on a wet seat you'd understand that it sucks to have your pants soaked through. Besides, a jacket and whatever helmet/hood+rain pants type combination you happen to have will keep you mostly dry, but the bike is only protected once you're actually on it. Actually, rain pants do double duty by keeping you insulated from your seat's wetness and stopping the water from the road and the sky from hitting your pants, but this is about seats....

tevers94 (author)thebludshed2009-03-23

haha true

Daax (author)2010-03-16

 Anyone else just use a shower cap? It's like they were made for it. Plus, they're much easier to store.

PKM (author)2009-03-15

+1 who thought this was going to be "put condom on bike seat, ride bike, optionally slip off seat".

santy22 (author)PKM2009-07-17


pojken (author)PKM2009-03-15

Ditto. In fact, I was already trying to remember where I put the condoms since it seems like it will work. (I got this free showercap-thingy that does the same, but I think a condom would be good alternative if ever it gets taken.)

shmuley95 (author)PKM2009-03-15

that would be me... hahaha good idea though.

minhocaloka (author)2009-05-30

wow!¬¬! I made this kinda job whit rc car body shells!=P

but i never think to make this to mi bike...


I'll try this=D


RoaringSilence (author)2009-04-30

I love this idea! Everyone else can fiddle with their silly plastic bags, I'm making me a seat condom too! :)

-5nip3- (author)2009-04-05


anmol27 (author)-5nip3-2009-04-10

wats lol

Kazeem (author)anmol272009-04-10

wats a annoyink troll?

RiddleOfSphinx (author)2009-03-21

A good way to upcycle milk jugs ;) And if you see anybody stealing it, you can yell at them as they think they're taking off with a good day's haul... " thanks for taking out the trash :D !!!" lol

sp33dstix (author)2009-03-16

How about using a regular plastic bag? This will serve two purposes.. 1) MUCH cheaper and it will fit ANY bicycle seat 2) Another use for plastic bags.

bowmaster (author)2009-03-15

I thought it was how to make a condom out of a bike seat.

xproplayer (author)2009-03-15

ok just making sure

xproplayer (author)2009-03-15

if u have no ideas for what to do with a vac form well u should be ashamed of urself those things are awesome

saintstoffel (author)2009-03-14

I love it. It's a glorified plastic grocery bag. I would love to do this. Where are those vacuum former instructables at?

xproplayer (author)saintstoffel2009-03-15

knowing instructables im sure its here somewhere

Yerboogieman (author)2009-03-14

i thought is was a condom put around your seat, lol.

xproplayer (author)Yerboogieman2009-03-15

lol same i was like wth

Harmodius (author)2009-03-14

The uptilted nose of the saddle with the cover on it (step 10) makes my very pudenda go numb just from looking at it. Do you really ride your bicycle with the saddle nose tilted up like that?

I think the front wheel is raised because it's in a storage rack.

I was looking at the angle of the saddle to the top tube of the bicycle,not to the horizon. Of course if the top tube is lower at the head tube than at the seat tube, the saddle might be level with respect to the horizon, but I've not seen any bicycles made that way.

stephenniall (author)2009-03-14

Cool idea i think i may do this at school Until ir ead this i used to do Sorta what the title said Lol I used to put food bags on the seat Or if i was riding in the rain I'd put a condom over the seat And take it off when it stopped raining

merijnvw (author)2009-03-14

Hey cool instructable. Is it also the purpose of this thing to sit on it when it has rained? Because from your text i understand that, but i would think it is a seat dry holder and before riding you remove it so your seat is dry? And if that's true, where do you leave it while riding or while it isn't raining?

AMK (author)2009-03-13

Nifty if you can get access to the press. If you are on the cheap, use disposable shower caps.

explosivemaker (author)2009-03-13

...dang, those vacuum things are cool....

Haas82 (author)2009-03-13

My grandma had on from leather. And it is widely used in the Netherlands for promotional proposes cheap bags with print that fit on bike seats are used. Good idea! but your years to late.

bumpus (author)2009-03-13

Great instructable! Might be a market for such an item! :D

mg0930mg (author)2009-03-13

Awesome, idea. It is very smart.

ve2vfd (author)2009-03-13

Thats a pretty darn smart idea! Pat

JakeTobak (author)ve2vfd2009-03-13

Indeed, pretty f'ing clever.

lemonie (author)2009-03-13

I knew someone who sprayed (motorcycle) chain-lube on his mate's seat - you don't get that stuff off easily - had to use plastic bags... Great Instructable L

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