£359.99
In stock
You are just £80.00 away from Free Mainland UK Delivery!
Our entire team at Gerry’s are all experienced anglers and can help you choose the correct tackle for any fishing situation. Please drop us a message or give us a call if you need any help.
You can return unused standard items within 30 days for exchange or refund.
We check our prices weekly to ensure we can combine our fabulous service with the best prices. If you find an item cheaper and in stock somewhere else, drop us a a message in the chat box and we can see what we can do.
This item is available for next day delivery. You can pick this in the checkout.
We offer free post to any mainland UK address with a basket of more than £80. We also send all over the world and the best way to find out how much postage you will pay is in our checkout. Add the items to your basket and then add your address. Our checkout will automatically calculate your total.
We have come from a tiny fishing store and grown into one of the biggest fishing tackle retailers in the UK winning countless awards over the years. We are still a family business offer fabulous service online and in-store.
Spread the cost of larger orders over 6 or 12 month 0% APR. We also offer longer terms with APR charges via V12 finance. Available in the checkout.
You can make your next purchase a little easier on the wallet by splitting the total into 3 payments by using Klarna payments in the checkout.
Double your footprint, double your comfort. At Gerry’s Fishing, we know that the Avid EXO is one of the fastest-pitching shelters on the market, but sometimes a quick-set bivvy needs a bit more “living room” for those week-long sessions or social trips. The Avid EXO Extension Cap is the perfect modular solution, transforming your standard EXO into a dual-compartment basecamp with a massive dedicated porch area.
Constructed from the flagship 20,000mm hydrostatic head EX fabric, this extension is as tough as it gets. It doesn’t just add space; it adds a level of protection and versatility that turns a shelter into a home. Whether you need a place to cook out of the wind, a “mudroom” for wet gear, or a social hub to host a brew for your mates, the Extension Cap handles it with ease while matching your bivvy’s khaki brown aesthetics perfectly.
EX Fabric Performance: Manufactured with the same 20,000mm HH material as the main bivvy for total waterproof reliability.
Massive Living Space: Adds a 2.25m wide porch, perfect for long sessions or socialising.
Versatile Front Panel: Features a “letterbox” style door with solid and mosquito mesh options to suit all weather.
Tri-Access Entry: Dual side doors (with mesh and solid panels) mean you can enter or exit from any angle, increasing airflow in the summer.
Rod Management: Includes two side rod retention straps to keep your setups safe while re-rigging.
Full Protection: Comes with a dedicated heavy-duty groundsheet to keep the porch area dry and mud-free.
| Feature | Details |
| Material | 20,000mm Hydrostatic Head EX Fabric |
| Internal Space | 225cm (W) x 180cm (D) x 140cm (H) |
| Packed Dimensions | 112cm x 30cm x 25cm |
| Total Weight | 12.2kg |
| Color | Khaki Brown |
| Compatibility | Avid EXO Bivvy System |
Heavy-Duty Clip-in Groundsheet
Rigid Support Bars
Double-Point Storm Straps
Oversized Heavy-Duty Carry Bag
Heavy-Duty Pegs
The “Dry-Zone” Strategy: In the winter, use the Extension Cap as your “wet area.” Keep your boots, wet coats, and bait buckets in the porch, and keep the main EXO capsule for your bedchair and electronics. By keeping the moisture in the extension, you’ll significantly reduce condensation in your sleeping area, making those freezing nights much more comfortable.
Does this replace the front of my EXO bivvy?
No, it sits over the front. You can actually leave the front panel of your main EXO zipped in for a “two-room” apartment feel, or remove it to create one massive, open-plan tunnel.
Is it hard to set up alone?
Not at all. Once the support bars are in place, the Extension Cap simply pulls over the front of the bivvy and pegs down. It adds maybe 5 minutes to your total setup time.
Can I use the side doors for a “link” setup?
Yes. The dual side doors are great for positioning your barrow or even parking a second small bivvy next to it for a shared social area.
Does it help with condensation?
Massively. By creating a porch, you’re essentially adding a huge “buffer zone” between the outside air and your sleeping quarters, which helps stabilize the internal temperature.
Our entire team at Gerry’s are all experienced anglers and can help you choose the correct tackle for any fishing situation. Please drop us a message or give us a call if you need any help.
You can return unused standard items within 30 days for exchange or refund.
We check our prices weekly to ensure we can combine our fabulous service with the best prices. If you find an item cheaper and in stock somewhere else, drop us a a message in the chat box and we can see what we can do.
This item is available for next day delivery. You can pick this in the checkout.
We offer free post to any mainland UK address with a basket of more than £80. We also send all over the world and the best way to find out how much postage you will pay is in our checkout. Add the items to your basket and then add your address. Our checkout will automatically calculate your total.
We have come from a tiny fishing store and grown into one of the biggest fishing tackle retailers in the UK winning countless awards over the years. We are still a family business offer fabulous service online and in-store.
Spread the cost of larger orders over 6 or 12 month 0% APR. We also offer longer terms with APR charges via V12 finance. Available in the checkout.
You can make your next purchase a little easier on the wallet by splitting the total into 3 payments by using Klarna payments in the checkout.




Penn Chest Size Guide
Small (36″-37″)
Medium (38″-40″)
Large (42″-44″)
XLarge (46″-48″)
XXLarge (50″-52″)
Wader Waist Guide
Small (28″-30″)
Medium (30″-33″)
Large (34″-37″)
XLarge (37″-39″)
XXLarge (39″-42″)
3XLarge (42″-45″)
Kinetic/Westin Chest Size Guide
Small (36″-37″)
Medium (38″-40″)
Large (42″-44″)
XLarge (46″-48″)
XXLarge (50″-52″)
3XLarge (54″-56″)
Grundens Chest Size Guide
Small (36″-37″)
Medium (38″-40″)
Large (42″-44″)
XLarge (46″-48″)
XXLarge (50″-52″)
3XLarge (54″-56″)
Vass Chest Size Guide
Small (36″-38″)
Medium (38″-41″)
Large (42″-44″)
XLarge (45″-46″)
XXLarge (47″-48″)
3XLarge (49″-51″)
Trakker Chest Size Guide
Small (38-40″)
Medium (41-43″)
Large (44-46″)
Xlarge (47-49″)
XXLarge (50-52″)
XXXLarge (53-55″)
Korda Chest Size Guide
Small (36″-38″)
Medium (38″-41″)
Large (42″-44″)
XLarge (45″-46″)
XXLarge (47″-48″)
3XLarge (49″-51″)
Guy Cotten Chest Size Guide
Small (86 – 94cm)
Medium (94 – 102cm)
Large (102 – 110cm)
XLarge (110 – 124cm)
XXLarge (124 – 134cm)
3XLarge (134 – 154cm)
Fox Chest Size Guide
Small (36″-38″)
Medium (39″-41″)
Large (42″-44″)
XLarge (45″-47″)
XXLarge (48″-50″)
3XLarge (51″-54″)
4XLarge (55″-60″)
Nash Chest Size Guide
Small (36″-38″)
Medium (39″-41″)
Large (42″-44″)
XLarge (45″-47″)
XXLarge (48″-50″)
3XLarge (51″-54″)
4XLarge (55″-60″)
Aqua Chest Size Guide
Small (38-40″)
Medium (41-43″)
Large (44-46″)
Xlarge (47-49″)
XXLarge (50-52″)
XXXLarge (53-55″)
Guru Chest Size Guide
Small (36″-38″)
Medium (38″-41″)
Large (42″-44″)
XLarge (45″-46″)
XXLarge (47″-48″)
3XLarge (49″-51″)
Preston Chest Innovations Size Guide
Small (36″-38″)
Medium (38″-41″)
Large (42″-44″)
XLarge (45″-46″)
XXLarge (47″-48″)
3XLarge (49″-51″)
Trouser Waist Guide (Inches)
Small – 28″ – 32″
Medium 32″ – 34″
Large – 34″ – 36″
X-Large 36″ – 38″
XX-Large – 38″ – 42″
XXX-Large 42″ – 46″
XXXX-Large 46″ – 52″