I recently bought the yoga mat backpack and instant felt discomfort on my shoulders. I had only my light travel mat at water bottle in the pack, went for a walk, and had chaffing and redness on my shoulder. The quailty of materials is poor and caused pain. I've never had a backpack do this... I emailed the company and never got a reply. I want to return this backpack.
Vast improvement over the one I had and it fell apart in a month
I bought it carry beach towels or a picnic blanket (not always a yoga mat). Bottom straps are adjustable, so it works great. There is also space to hold quite a bit on the inside.
Went on a retreat and it was used as my carry on. Worked perfect!