The perfect dog carrier backpack: Why size is more than just a measurement
When it comes to dog carrier backpacks, the first instinct is: Measure, measure, measure. Back length, width, weight. But the perfect fit is far more than just a numbers game. It’s a balancing act between your dog’s objective measurements, your own comfort while carrying, and the subjective expectations you both have for your shared adventure.
Just because the numbers add up doesn’t automatically mean the backpack will feel perfect for either your dog or you. The ideal fit comes from the interaction between dog, human, and your respective expectations.


Sitting or Lying Down: Your Dog Adapts
Dogs often move differently in a backpack than we imagine. They are true masters of adaptation:
- Curling Up & Tucking In: Many dogs love to snuggle up, tuck their paws close to their body, and curl up almost like little balls. This is true even for dogs who normally stretch out when lying down.
- Sitting or Lying: Some sit upright to observe their surroundings, while others prefer to lie down as soon as they get tired.
Important Tip:
Don’t expect your dog to lie fully stretched out in the backpack like they do on their dog bed. Most dogs don’t lie completely flat but instead find a cozy, secure position. This way, they stay compact and safe.
Backpack Models and Typical Positions
Different models offer various seating options:
| Example Model | Typical Sitting Position | Notes |
|---|---|---|
| PeakStone, Dachshund, Bulldog | Dog sits or lies crosswise from one side window to the other | Provides more length/width space, better for lying down |
| MountainRock | Dog sits diagonally forward | Good for dogs who like to sit and look ahead |
| ROOFPACKER | Dog can sit crosswise or facing forward | Maximum flexibility in positioning |
The models PeakStone, Dachshund, and Bulldog are designed so that the dog sits or lies transverse to the direction of travel. As shown in the graphic, the width of the backpack is used optimally. Through the side mesh windows, your dog always has a clear view outside.

In the MountainRock, the dog typically sits facing diagonally forward. However, depending on build and character, they can also curl up inside. Some dogs prefer to remain upright, while others lie down comfortably and snooze peacefully during the trip.

Possible Lying Positions in the
PeakStone Backpack, Dachshund Backpack, Bulldog Backpack:
The dog lies stretched out with tucked-in paws in the backpack, while resting its head comfortably on the side mesh window. This protected position offers a sense of security and allows the dog to attentively observe its surroundings or simply enjoy the fresh air.
For many dogs, this side-lying position is the most comfortable way to spend even longer tours in a relaxed manner. The dog rests transverse to the direction of travel and is slightly curled up to experience maximum cozy comfort, high stability, and optimal relief.

Important Considerations Before Buying: The Trade-Off
The ideal backpack size is always a trade-off. Physical limits cannot be avoided: A larger backpack means more space for the dog, but also more volume and usually a higher carrying load (the dog’s weight) for the carrier.
Here is what you should assess realistically:
Carrying Comfort for Humans:
Do you prefer a model that is as compact as possible, or do you value a larger volume with cushioning properties?
Purpose of the Backpack:
Are you using the backpack primarily for demanding hikes, bike tours, train travel, or occasional city walks?
Exceptional Scenarios: When Measurements and Feelings Aren’t Everything
The most common challenges arise when measurements (objective) and expectations (subjective) collide. These case examples show you when a willingness to make a healthy compromise becomes necessary.
Back Length & Window Height Beat Weight
- Initial Situation & Problem: Charlie weighs 9 kg (approx. 19.8 lbs) and is actually well within the weight range of the PeakStone Backpack M (designed for up to 12 kg / approx. 26.5 lbs). However, due to his shoulder height of 43 cm (approx. 16.9 in), it sits significantly above the window height range (20 – 40 cm / approx. 7.9 – 15.7 in). As a result, the backpack is too short in height and Charlie sits unergonomically.
- Solution: In this case, body size rather than weight is the decisive factor. Charlie switches to Size L (window height 25 – 50 cm / approx. 9.8 – 19.7 in). Although the Size L backpack could technically carry more weight, it fits Charlie perfectly in height. His head rests comfortably in the window, his spine remains supported, and the backpack provides full ergonomic stability.
Lying Down in the MountainRock Backpack
- Initial Situation & Problem: Would you like your dog not only to sit upright in the backpack on longer tours, but also to be able to lie down completely stretched out? In the MountainRock Backpack, the base area is primarily designed for a stable, upright, and ergonomic sitting position. If your dog lies down inside, the design means they can only do so curled up. For many dogs, this is fine during short breaks – for dogs that want to sleep stretched out, it becomes uncomfortable over time.
- Solution: The MountainRock Backpack is designed primarily for your dog to sit in, providing maximum stability while hiking. If your dog wants to lie flat and stretched out during the outing or break, we recommend switching to a model with a wider lying surface, such as the PeakStone Backpack, Dachshund Backpack, or Bulldog Backpack.
Practical Tips for Choosing the Right Backpack
To balance the needs of both dog and human, consider the following before purchasing:
Cozy and Secure or Maximum Space?
How should your dog feel? Do you want a compact, cozy fit that most dogs prefer, or do you prioritize maximum space and freedom of movement for your dog, which will require a larger backpack volume?
Your Compromise
What compromise in carrying comfort are you willing to make if the backpack is meant to give your dog as much space as possible?

Conclusion: Comfort Matters Most
The fit of a dog backpack is a complex interplay of objective measurements, comfort, and individual perception. It’s not just about the number on a measuring tape, but about ensuring that both dog and carrier feel completely comfortable on their journey together.
In most cases, you will find the TARIGS backpack that fits both of you perfectly. Only in special situations – for example, with very large dogs requiring maximum space, or when a dog’s measurements make strict airline requirements impossible – will a willingness to make a healthy compromise be necessary.
With realistic expectations and our guide, you can find the ideal TARIGS Backpack for relaxed and safe adventures with your four-legged friend.
And don’t forget: tag us on your adventures! #tarigs










