Prime (KS3) Freestanding Kit
Prime (KS3) Freestanding Kit
All duties and tariffs pre-paid. No extra charges at delivery.
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The Prime (KS3) Freestanding Kit combines the fast, responsive rebound of the KS3 Prime Spring with a compact base that is easy to set up, pack away and take with you. Its height can be adjusted for both adults and children, making it an excellent all-round cobra bag for home training.
Who This Kit Is For
This kit is ideal for anyone who wants a high-performance cobra bag with a simple freestanding setup, without the need to make a DIY base. The Platform Paddles come apart completely, allowing the kit to fit into a compact box measuring just 19 × 7 × 7 inches. This also makes it a convenient option for travel or for packing away between training sessions.
Suitable for Small Children
The KS3 Freestanding Kit can also be converted into a shorter setup for small children as young as five. Simply remove the Mast and Click Bar, insert the Prime (KS3) Spring directly into the Base Connector and tighten the steel clamp around the Base Connector collar to secure the spring firmly in place.
This creates a compact version of the cobra bag at a comfortable height for younger users. As they grow, the Mast and Click Bar can be added gradually to increase the height.
Adult supervision: An adult should always assemble the bag and supervise children during use.
What’s Included
- Prime (KS3) Spring : Third-generation spring made from a unique formulation of metals for outstanding rebound performance and longevity.
- Genuine Leather Prime Target Ball : Premium leather target ball designed to provide an ideal balance of speed, power and durability.
- Target Ball Adapter : Extendable adapter designed to hold the target ball securely while maintaining top-section rigidity and fast rebound performance.
- 2 × Click Bars : Lightweight, rust-free aluminium bars used for overall height adjustment and control of the bag’s range of movement.
- Polymer Red Bar : A lighter and shorter top bar for increasing the speed and intensity of the rebound.
- Alloy Mast : Lightweight, rust-free aluminium mast designed for general home training use.
- Base Connector : Rigid composite-fibre connector designed to secure the mast firmly to the Platform Paddles.
- Pair of Kewlus Sandbags : Designed to stabilize the base when filled fully with sand.
- Platform Paddles : Strong composite-fibre paddles that come apart completely for compact storage and travel.
- Olympic Weight Plate Sleeve : Slides onto the mast so that one or two of your own Olympic weight plates can be placed above the sandbags for increased base rigidity and improved rebound performance.
Setup & Performance Tips
For the best performance, fill the included sandbags completely to the top. Wet sand is ideal because it provides greater weight and stability. Use a heavy-duty plastic bag as a liner inside each sandbag.
The included Olympic Weight Plate Sleeve allows you to place one or two of your own Olympic weight plates above the sandbags. This increases the rigidity of the mast and improves rebound performance.
If you do not have an Olympic weight plate available, adding an optional second pair of Kewlus Sandbags is highly recommended.
For maximum rigidity and additional height, consider the O3 Kit with its OctaBase, or combine the KS3 Core Kit with a DIY base .
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Shipping & Delivery
Shipping & Delivery
Shipping is calculated at checkout based on total weight and price, with some periodic discounts. Currently there is free shipping on orders over $200 USD.
USA & Canada
Orders for the United States and Canada are typically shipped from our North American warehouse in Canada, with most deliveries arriving within 2–5 business days.
If an item is temporarily out of stock in North America, it may be shipped directly from our international warehouse. In that case delivery usually takes around 1–2 weeks, depending on location.
Please note that an adult signature is required for delivery of cobra bag kits. The courier will NOT be able to leave the package unattended.
International Orders
Orders outside the USA and Canada are shipped from our international warehouse and typically arrive within 1–2 weeks, depending on destination.
All duties and taxes are pre-paid, so there are no additional fees upon delivery.
Multiple Shipments
Because we operate multiple warehouses to keep delivery times fast, some orders may arrive in separate packages if items ship from different locations.
Tracking
You will receive an email with a tracking link as soon as your order is shipped. Orders are not shipped on weekends or public holidays.
Pre-Ordering Products
Some products may be available for pre-order. If you place an order containing both in-stock and pre-order items, the entire order will ship once all items are available.

I did an extensive research before pulling the plug. This one is superior in every aspect. Very well built. Sturdy and stable ( with the sand and couple 45 plates ) unshakable. Incredibly easy to put together.
Now, the thing we use it for, the lunch and the bounce, it’s amazing. Great feedback and bounce.
I know as a consumer we feel safe knowing things that can be returned are safer but with this you wouldn’t want to return it even if that was an option.
Let me wrap it’s up by the customer service, you are not going to get a better service. Fast communication with care and genuine customer support.
I’ll buy it over and over if I have to.
Worth the investment.
Don’t hesitate to pull the plug. Everything about it is top notch.
I absolutely LOVE my Kewlus bag. I get an amazing working, I'm dripping sweat after just 10 minutes punching it, and i have a blast! Outside of the set up being awesome, the customer service is Outstanding! I had a leak in one of the bladders so I reached out to customer service, and a replacement was sent out that day, no questions asked. When you have an amazing product, and amazing customer service, you're bound to build a huge business, and I will always support this company due to the way they have treated me. It's so refreshing to have a company that actually cares about their clientele. If you're looking for a great workout thats fun and helps improve you ability to hit a moving targer, INVEST IN THIS SYSTEM TODAY!! Thanks Kewlus team, y'all truly do rock!
Highly recommend grabbing yourself one of these ks3 cobra bags!
Pros: Very high quality material.
fast and responsive.
Easy and affordable to upgrade with its modular abilities.
Keeps up with other professionally used bags such as fierce. (Sorry if naming other brands is not ok).
Great for beginners as you can adjust the speed with a simple click until you catch on!
Cons:
The only real downside which is fixable and not a big deal is the squeak, because all the metal bars click together, if you hit it on edge it turns the bar slightly causing a squeak. (Easily fixed with a tiny bit of grease on the bars)
Recommend grabbing yourself the red bar with your order for later use as it’s not very expensive and will save you delivery fee later when you want more speed!
The owner Reedy is super helpful and has lots of helpful videos which makes me support this brand even more!
Glad I purchased this bag after going back and forward trying to decide which to purchase on the internet (so many these days to choose from happy I chose Kewlus).
Why is this bag so great and how does it compare to others?
Kewlus bag is modular as stated but moving it into the corner out of the way is very convenient when you use the kewlus sand bags vs. a competitor cobra bag that uses a fillable base (for me it's easier to move some sand bags instead of a base of water filled or sand filled container where it's purpose is to not move).
The leather bag is very well made (smells great when you remove it from the shipping packaging) and it's built to last, no cracking after owning it for 6 months now, plus is it's replaceable! There are other bags in the same price range do not have a bladder and don't have replacement bags available. It's also a bit lighter in terms of weight so it doesn't fling around on the base that holds the bag unlike other cobra bags. I've noticed I haven't had to pump it as often as a result compared to a competitor cobra bag at the same price range.
Lastly, Kewlus' customer service is also five stars. Reedy was quick to respond to my questions and kind enough to send me a replacement part when I broke a piece (it could have been my fault but Reedy sent me a confirmation of a replacement piece right away via email with shipping info.)
Overall, I am very happy with my cobra bag and can't wait to see what else Reedy has in store for it.
I did some online research and almost purchased the Grodex Cobra Bag. I'm so glad I found the Kewlus Cobra Bag instead. I can't recommend the Kewlus Cobra Bag enough. The quality is top notch and very sturdy despite the modular design. I was expecting the product to be flimsy, but I couldn't be more wrong. I have practiced martial arts for over 10 years and can hit a bag with decent power. The Kewlus bag held up fantastic so far and rebounded quickly with the heavy duty spring. The Customer service at Kewlus is unparalleled! Reedy was very responsive to my inquiries even post sales. I won't hesitate to buy Kewlus products in the future for all the reasons mentioned. Awesome product! Thank you.
Absolutely brilliant system , my son loves it and the ease of setting up where you want to use, and to be able to pack up and put away. Top product , highly recommend to aspiring boxers, well done Reedy