Quick answer
To install a cord lock on a drawstring bag or hoodie, string the drawstring tails through the lock's two holes from the bottom, press the spring button, and slide the lock to your desired position.
Choosing the right cord lock size
The most important factor is matching the cord lock’s hole size to your drawstring’s diameter. A lock that is too small will jam, while one that is too large will slide loose and fail to hold. Measure your cord with a ruler or caliper before ordering.
Round cord locks (like the teal 7 mm option) are ideal for lighter cords used in hoodies and small pouches. For thicker drawstrings typical of backpacks or utility bags, an 8 mm lock provides a secure grip without oversizing.
Spring mechanism vs. no-spring locks
Most plastic cord locks use a spring-loaded button: press to release tension, release to lock. This design lets you adjust the cord length easily. The white 8 mm lock and the teal 7 mm lock both use this reliable spring style. No-spring cord locks (screw type or pinch style) exist but are less common for quick adjustments.
Step-by-step installation
- 1. Prepare the cord ends: Cut the drawstring to your desired length (account for the lock). If the ends are frayed, melt them with a lighter briefly or seal with clear tape to prevent unraveling.
- 2. Insert one tail at a time: Hold the cord lock with the button facing up. Insert one drawstring tail into one hole from the bottom (the side opposite the button) and push it all the way through. Repeat with the second tail into the other hole. A common mistake is inserting from the top – then the lock won't slide or grip. Always thread from the bottom.
- 3. Check the orientation: After threading, both tails should exit the lock from the button side. Slide the lock down to the midpoint of the drawstring. You should now be able to press the button to slide the lock freely. If the lock won't move or feels stuck, you may have inserted the cord through the wrong pairing of holes; re-thread from the bottom.
- 4. Secure the ends (optional): For extra insurance, tie a simple knot or heat-seal the very ends of the drawstring. This prevents the cord from slipping back out if you pull too hard and the lock momentarily releases. Skip this for hoodies where you want the cord to be removable for washing. Always do it for bags that get heavy daily use.
- 5. Test the adjustment: Press the button firmly and slide the lock up and down the full range of the drawstring. Release the button and check that the lock stays put without slipping. If the lock slides without pressing, the cord diameter is too small for the lock hole. If you can't press the button easily, the cord is too thick.
Products mentioned in this guide
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Round Cord Lock | Teal | 7 mm: This teal round cord lock has a 7 mm hole and is designed for use with drawstrings up to 7 mm wide. It works best for medium-weight cords in hoodies and bags, and its bright color adds a decorative accent.
Round Cord Lock | Teal | 7 mm
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Cord Lock | White | 8 mm: This white spring cord lock fits cords up to 8 mm wide and is built for thicker drawstrings. Choose this when you need a secure hold on heavy-duty cords found in backpacks or outdoor gear.
Cord Lock | White | 8 mm
