K9 Sports Sack
K9 Sports Sack Booster Block
K9 Sports Sack Booster Block
- Raises dog 3\ for a better fit in between sizes
- Removable washable cloth cover
- Compatible across XS to XXL sizes
Free UK Delivery
Orders Over £49
No-Hassle Returns Policy
Complete Peace of Mind
Charity Profit-Share
10% Back to Good Causes
Expert Advice
Via WhatsApp
Protect this for every adventure
Added to your basket with this product. Full terms: 5-Year · Lifetime. Doesn’t affect your statutory rights. Cancel within 30 days for a full refund.

The little lift that makes a K9 Sport Sack fit just right.
Sizing a dog for a backpack carrier isn't an exact science. If your dog is between sizes, has a wide body but a short back, or is still growing, the K9 Sport Sack Booster Block sits snugly in the bottom of the bag and raises them by 3" (7.6cm). That small boost makes all the difference to how comfortable and well-positioned your dog sits, and how the carrier feels for you. Stack two blocks for a 6" lift.

Key Features
- 🐾Raises your dog 3" (7.6cm) - perfect for in-between sizes, short-backed or growing dogs
- 🐾Sturdy quality foam - holds its shape and supports your dog comfortably
- 🐾Removable, washable cover - easy to keep fresh
- 🐾Stackable - use two for a 6" lift
Which size?
| Size | Dimensions (H x W x D) | Fits Carriers |
|---|---|---|
| XS/S | 3 x 8 x 5" (7.6 x 20.3 x 12.7 cm) | XS and Small bags |
| M/L | 3 x 10 x 6" (7.6 x 25.4 x 15.2 cm) | Medium and Large bags (and XL/XXL if needed) |
Match the block to your carrier size. Not sure if a Booster Block will help your dog's fit? Message us on WhatsApp with your dog's measurements and we'll advise.
Great backpack for my wee dog, and clearly very high quality. Would definitely recommend and buy again from Pets Own Us!
Pets Own Us FAQs
Please read our FAQs page to find out more.
For questions not covered in our FAQs, please contact us for assistance
Will I get confirmation of my order?
As soon as we receive your order, we'll send out confirmation to your email address. This means we've received your order in our system, and we've pre-authorised your payment method, ready for your purchase.
I placed my order but did not receive a confirmation email. Why?
If you recently placed your order and didn't immediately receive a confirmation email from us, then there might be a few issues we can look into: 1. Our emails might be going to your junk or spam folder. 2. There might have been a misspelling when you entered your email address during checkout. 3. Your email server has very strong spam filters and is identifying our emails as spam so the emails aren't going through. If any of these are happening, we encourage our customers to provide an alternate email to support@petsownus.co.uk
How long does it typically take for your products to be dispatched?
Our delivery times vary depending on the product and supplier. Please review each product page for accurate fulfilment timeframes. Some items offer next-day delivery, whereas some can take upwards of 10 business days to arrive.
I have specific questions about an item - where can I find this information?
If you've reviewed the information listed on the product page and still have questions, please reach out to us via WhatsApp or email. Please note that some of our most popular products have their own FAQs at the bottom of the page.
Do you deliver outside of the United Kingdom?
We deliver anywhere in the UK (United Kingdom). There may be additional charges for the 'offshore domestic regions' and 'Scottish Highlands': Channel Islands, Isle of Wight, Isle of Man, Scilly Isles, Scottish Highlands, Scottish Islands and Northern Ireland, these charges will be clearly displayed at checkout. If your address is outside of the UK, please contact us for a delivery quote by email support@petsownus.co.uk.