The combination of a harness with removable storage, and a *safe* carrying bag with multiple points that anchor it to the harness as well as to your own body, is something that just isn’t available anywhere else.The carry bag folds down to nothing, so that it can even be stored in the mini backpack that attaches to the harness.The quick and impeccable customer service was a welcome surprise.Some tips, and potential issues that may have a better solution than my current approach:1. Very furry dogs can be tricky to size correctly. When measuring the neck, really pull your measuring tape (carefully) until it’s right up against your dog’s skin, gently moving as much fur as you can out of the way. The harness’s neckpiece is a soft stretchy mesh that will be forgiving for overly large necks, but isn’t adjustable at all. So size down in terms of neck size.2. Skinnier dogs may have chest measurements that bring you to a size with neck measurements much higher than those listed in the table. I’m still trying to figure this one out… so far I usually anchor the harness neckpiece to my dog’s collar, and might have a seamstress tighten the mesh collar.3. Length matters (ha). I was tempted to size down to a Medium for my Corgi for a tighter and more supportive fit. But it was extremely obvious that a smaller bag just wouldn’t be long enough.4. This is somewhat Corgi/Dachshund-specific, but was a big issue for me: short legs can also be easily retracted from the sack’s foot openings. With a dog which is entirely used to the situation, this probably wouldn’t be an issue at all. But if they squirm even a little bit, a leg can easily pop free, and then they’ll quickly feel trapped and anxious.Needs more back support and shoulder padding but other than that it would great my corgi fits perfectly and she enjoy the ridding in the backpack.Although Sputnik would rather run, he is a smaller guy so its nice this will actually compact down in his pack until he needs it. We also carry him while biking. This also snugs down so he can’t fall out or wiggle out.very little structure, and small for its sizing.need to return.Great product for our little dog.Returned. Very Cheezy for the price. Google little Chonk .com. Far superior and about same cost. Unfortunately not avail on Amazon but it should be.Only company that had veterinary involvement in the design. My corgi loves going in this but for whatever reason was figitty in the K-9 unit. The sides are netting and not only do not look durable if ripped could cause a dog spill.I thought this was a great idea to make my dog carry his own stuff. However for what you get it’s absolutely not worth the money. And putting my dog in the sack is a huge pain in the ass while there’s other dog carriers that zip onto the dog easier. If this was 50$ id be reasonable but 132$ is a far fetch