Classic (KS2) Cobra Bag Spring

First off I want to start by saying thank you sincerely. I started a boxing class back in April (July as of this review) and unfortunately had to move locations because of some drama at the gym that was sponsoring us. I know boxing isn't all about the equipment but as someone with a learning disability I struggle without having that feedback the equipment gives. So I started looking for some home equipment in our interim and while looking for a way to hang a heavy bag I stumbled across your YouTube. I fell down a long rabbit hole of watching your videos in amazement of not only your ingenuity but your attitude and approach are humbling. I was watching the progression of your cobra bag in pure disbelief when you pulled out that exercise spring twisting thing and compared the name brand spring to it. That's about when I saw that you sell your own. Came to your website and was overfilled with joy of your success. Good for you man, honestly. Then if it wasn't already a fairy tale experience not only do you sell your own professional grade equipment now but you're still out here giving us that are not financially well off an opportunity to thrive with DIY projects for cheap. That level of honesty is so pure and rare today, especially from a business aspect that I had to buy it. Man if you went through all that trouble to fleece me for $30 all I could do is laugh, so I did it.

While waiting I grabbed the other parts you listed in your tutorial. They ended up a wee more expensive than what you advertised (grumble :) ) so I opted for black steel instead of galvanized since it was cheaper and it's mainly indoors. I got the wrong size pool noodles at first I figured the thicker ones would be better but the holes are different sizes and I didn't account for that while I was trying to make the ball top. Once I figured that out the next set squeezed nice and tightly on and I figured that's what you meant for us to get. The spring arrives, I quickly run to my closet of a workout area and start assembling. I chose to use the metal straps instead of trusting massive amounts of tape. The wood base I'm using is also slightly smaller, on behalf of the real engineer helping me (just that it would be structurally identical and lighter) than what your videos were recommending. I'm also using the one stand to switch between the reflex and spar bar so all I have to do is swap out the middle section. Took me a little while to secure some real weights to hold it down but I finally got a nice 45 lb to sit on it. Would absolutely recommend having about 100 lbs but the 60 I have right now is ok. I lean my heavy bag I can't hang on the opposite end to give it that little extra for the moment but I'm really trying to avoid the jank. I just swapped out for a new head as well I did it twice what your video said. I haven't gotten a chance to really go at it because I ran out of tape (as you can see in the photos lol) but it seems sturdier and I'm not sure if it is or not but seems quieter with the added noodle to the neck down to the spring. Anyway I've been using this bad boy for a couple of weeks now and I haven't had any major problems or any that weren't self inflicted from being less than handy.

Again this whole setup you have is beautiful and I'm spreading the word as fast as I can. My coach loves the bag and I might be putting a few more of these bad boys together especially since we don't have a proper gym this being so portable is brilliant (I FORGOT THE WHEELS oops). Apologies for the novel I've written I just wanted you to know that I truly appreciate what you have done and are doing and that I look forward to giving you more of my money in the future.

Much love you beautiful human <3

Probably paid 30 for the spring 10 for everything else to build it definitely beats paying 300 for one and better recoil than standard ones I used

Incredible product, if you follow all the steps on his website and YouTube demonstrations, you will succeed in making your DIY cobra bag. Thank you Reedy and team for sharing your love and creativity with the boxing community!

I was able to make a very fast cobra bag thanks to your videos. I plan on buying two more springs because friends have requested me to make them a fast cobra bag.

I purchased the spring and the spring cap holders. Once everything was assembled it gave a decent performance but his set up videos are a total illusion! First off making an adjustable base using a 3/4 pipe to a 1 inch pipe just does not work! I went to 5 different hardware stores and not one of the fit correctly and did get past the thread so I just went with a 3/4 pipe that came up to end of my thigh muscle. Secondly the suction cup setup does not work on all floors so keep in mind if your floor is not ultra smooth it won't stick for long. The dimensions for the board to hold the unit it place with the suction cups are way off and take some adjusting for it not to move when you strike it. The spring has some snap but definitely not as fast as the original cobra bag and you can even see the difference in his video. You can compare both videos if you look up Ryan garcia cobra bag you will see the snap back on that bag is definitely more faster and sturdy. But for a 100 dollars for a diy it's something but I definitely wouldn't buy the kewlus ready made build for 250!

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

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

Just as advertised. Great product, great price.

I absolutely love the spring. Just in general Reedys product was crafted from dedication. The teaching of diy builds sets Reedy apart from other businesses. Hands down a good product and a great person who backs hos product.

Great product works as advertised

Produit conforme à mes attentes. Très bonne communication et livraison rapide. Bravo!

This cobra bag spring is great really hard stuff I made different DIY from your website with poll noodles.with basketball and with soccer balls and spring works great with everything it was 100 percent worth buying thanks for making such a great product

Works great!

This made my diy cobra bag so good i regret not getting the full kit for the perfect experience .

I purchased the spring and followed the instructions to assemble a DIY reflex bag. The assembly went smoothly and the setup works incredibly well, with great action from the spring. I plan on upgrading my build over time and look forward to improving my reflex bag in the future.

This is the 2nd spring I purchased from your company in 2 years.I am the only user, the last broke 3 weeks ago. I have been setting up Boxing equipment for 50 years + , l did buy my first reflex bag (maybe everlast's) 3 years ago) and that short black spring broke after about 1 year, I then bought.your Spring, that one last about 18 months .I use the original reflex bag with my set up because it is HEAVIER than the 2 other bags(too light) that I made. Maybe that is why your last spring broke. I do love my Cobra as well as my speed bag,heavy bag, double end bag and my new 200 lbs. Water bag. I just hope your spring lasts.

Excellent!

So happy that the Youtube algorithm placed Kewlus' videos on my feed. When I saw that he was selling the spring I purchased one and built my own reflex bag for a fraction of what they sell for online. Best part is if anything breaks I can easily repair it myself. Thanks Kewlus!

Great made the DIY cobra bag. Works really well. Very snappy. Great price for it too.

The KS2 Cobra Bag Spring has exceeded my expectations. It’s a fantastic piece of equipment that enhances my training and keeps me motivated. I highly recommend it to anyone—regardless of age—who is looking to add variety and effectiveness to their workouts. It’s a game-changer and a great investment for anyone serious about their fitness journey!

Amazing product, works as advertised and marketed. Works perfectly, and a perfect substitute for a cobra bag !

Not only a great deal but got me into making my own equipment. Is becoming a new past time for me.

It’s a very good spring and I like how you can adjust the height to adjust the speed highly recommend!