Oh man I loved these in the 90’s I had so many of them!
Growing up in a beach town these were all the rage
This is a 90’s Ixtapa Mexico cotton backpack
Ixtapa is a pacific beach resort in the state of Guerrero
Sounds lovely to me!

Cinch top
Long straps that can be adjusted a little by untying the knot already in place

One yellow stain at top of bag check photos for staining

The image on the front reminds me of a Mayan calendar

Measurements taken are

Length top to bottom: 22. 5 in
Width: 12. 5 in
Strap length from top to bottom: 24 in

This item is sold from a vintage boutique in Portland Oregon.