Kewlus DIY Cobra Bag Spring (KS2)

I have been on the hunt for a budget cobra bag for a long time. I have a lot of leftover scrap from various other household projects around the house, too. With a little elbow grease, some basic tooling, some odds and ends I already had around, and a couple trips to the hardware store, I was able to build my own cobra bag at significantly lower cost and rescue some of my scraps from the landfill. I would highly recommend Kewlus products for anyone looking to up their training on a budget and any athlete who also enjoys a DIY project.

I ordered just the spring, it shipped very fast, I think in a day or two. Works better than I expected and how you can adjust the speed with the DIY setup that Kewlus and Csquaredboxing cover in how to videos, you really cant beat it. And I'm not just talking about price. From the way it functions to how you can customize height, speed and base it truly is a hidden gem of the boxing world!

The spring works amazing, and following your youtube tutorial made it super easy.
The homemade version is about 200 dollars cheaper then the cheapest cobra bag, and is better in every way due to how much adjustment you have. Like stated in your video, having everything be modular makes it so nice if I want to change out the bag, or if something breaks in the future. Highly recommend

I have 2 of these. I fabricated my Own Cobra bag and it works perfectly. It cost me less than $100, which includes the Kewlus Spring and Noodle Foam and the wheels for my Cobra Bag. It's easy to move around. The rest of materials i used is from Scrap metal. Worth it to have one, specially if u know how to fabricate stuff. Easy job to make it.Thank's🤘🏼🤘🏼

The spring is deadly, you can fit it with cheap material, or with the kit, anyway anything you choose is okay, because this springs work the same like other cobra bag that you over paid, definitely the better choice. Thank you Reedy

Overall, Spring reflex action is good but DIY build can be improved. Some of this could be be me but want to share issues I ran into during build.

1) Finding a 3/4 & 1 Inch metal pipe that fit between each other is tough. I tried HD, Lowes, Menards, etc and didn't have success. I spent 3-4 hours using hammer and sanding tools/brushes to make things bit more manageable.

2) Butterfly clamps are good but need something more sturdier. Jabs are great but if you plan to mix Jab with uppercuts you might send the pvc pipe flying upwards. I have to hold back power on uppercuts to overcome this issue. My thinking is that better or more clamps are required to overcome this issue.

3) I have no vibration or sound when I use the bag which is great. If you pay close attention to the build it should be mostly sturdy.

4) I did not build circular base and choose rectangular shape so I could put two 55 lbs plates (total 110 lbs) on the base. I attached flange to a rectangular shape pressure treated wooden board (approx 1.5 inch thick and 10 inch by 40 inch). I am realizing circular base would be better. I will rethink this later.

5) Note, with amount of time spent to get the metal pipes to fit in one another and $'s spent (Metal Pipes, pvc pipe, flange, pvc connector, butterfly clamps, bag, spring, duct tape, funnel, screws, and wooden board), I would highly recommend just buying the whole kit vs spring. Now, if you have some of these things at home already, then you may find it beneficial to buy spring and build. This was not the case for me.

Lastly, let me just point out that the bag is so much fun. I have gotten smacked in my face a few times but still enjoy very much. Thank you