Lockable Bicycle Trunk





Introduction: Lockable Bicycle Trunk

Build a small, lightweight trunk for a bicycle that you can also lock. This cost me about $10.

Step 1: Obtain Trunkish Object

I used a 16" toolbox from Lowes, which cost me about $8. The brand is "WorkForce" (very tough sounding, no?) and it has a metal clasp, pass-through for a lock, and is made of plastic - all traits it needs for this project.

Step 2: Drill Holes

I lined up the tool box where I wanted it to be on the luggage rack, and marked where it passed the cross members of the rack. These are where the trunk will attach to the rack. I used cable ties (about $2 for a small bag) to fix it to the rack.

Step 3: String It Up

I drilled 12 holes in all. That's 3 rows, with 2 holes on each side. I laced the cable ties through these holes, leaving plenty of room on each end to tighten them. Once they were in, I lined it back up on the rack, and tightened them down.

Step 4: Enjoy

Once the ties were tightened completely, I snipped off the ends so it would look a little cleaner and less...you know...cable-tied. This certainly doesn't make this the most secure system in the world (anyone who wanted could slice these ties and take the whole box), but ot's more of a method of helping honest people stay honest. I don't leave anyhting very valuable in there for long periods of time (like outside my building all day), but it works well when I go into the bar for a drink, but don't want to carry around my blockbuster movies.



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    29 Discussions

    I used a 50 cal. ammo box (different sizes available, most military surplus stores have these for a few bucks). These are lightweight, metal, waterproof (o-ring lines lid) with a latch that can be modified to be lockable. I easily drilled holes to attach to rack in the bottom, and slapped down some duct tape in the bottom after fastening with zip ties. This size can hold a 6-pack, a bunch of tools and crap, a big lunch, a jacket, etc. It quite sturdy and light weight.

    2 replies

    Wicked. I've got a couple of plastic cat litter bins that are going to become panniers kind of like that. After I wash them of course.

    Awesome! I love everyones creative additions as well! My husband made his out of an old plastic marine battery box. He had to add a plastic soda crate on top for extra storage. He attached that with small bungee cords. He did the same attachment of the box with the zipties.

    chuck bike.JPG

    I would just take that handle off; this way it doesn't look like a you're going fishing.

    This is a great low cost alternative to buying a commercial locking trunk from a bicycle store. I'll size and cut a piece of plywood to fit the bottom of the case and then drill holes for a "bolted on" option. Thank you for sharing the clear instructions and photos!

    You can also mount a few speakers in the box, and just connect those speakers to your mp3 and voila... you have music on your bike!!! And for real fun, get yourself a nice and small amplifier and connect it all together :-)

    I would pesonally use a nice big U bolt instead of zipties. Im going off to college soon, and ill need a trunk though. Good Instructable. ++++++++++


    12 years ago

    Nice instruction. You could also bump up the security a notch or two if you wanted with a bracket and screws from a hardware store, rather than using the zip ties.

    1 reply

    Not to be negative because it is a good idea, but if you can drill holes in it with simple power tools i wouldn't leave anything valuable in there, still a good idea!

    Awesome tutorial- It would probably work a lot better than my bungee cords and is able to resist the elements (little punk thiefs). Now you just need to make the rear reflector visible. ( ; I didn't see one on the bottom of your bike rack but maybe it is on the fender- I can't really tell by the picture angles. Anyway, great job!

    I made one of these for myself. I live in Key West...a perfect place for a bike trunk. I ride my sweet cruiser everywhere! I used bolts, the kind that are smooth on the head, to secure my tool box trunk to my bike rack. Works perfectly and much more secure. Noone can steel my trunkl. They would need tools to remove the whole rack or just steel my bike. I invented this idea on my own but then searched the web to see if anyone else had thought of it. And here you are! Kindredspirit....cheers to you!

    Pretty cool - I made one out of a metal ammo case (lockable), attached with stell u-bolts, that I don't worry about leaving behind, but it is a bit too heavy.

    1 reply

    Exactly what I was going to suggest, as I was reading thru these replies. $5 for a .50cal ammo can, $7-12 for a decent lock and latch, done deal. You can quiet the metallic banging inside the can, by using 1/4" foam, or cut-out sections of an old wetsuit