They do sell strap pads now! I have a 17" for travel and a 15" that did duty as a diaper bag/daypack. Got pads for both and it’s been such an improvement. They used to be uncomfortable to wear for long stretches, but now I can wear them much more comfortable on long travel days/hikes. They are well made, I expect them to last a long time and be patchable. My kiddo is starting kindergarten in a couple months and we’ll start with the mini pack that’s been the daycare/preschool bag - though last I checked the one-size strap pads that were available didn’t fit that size bag.