REI Trail 25L hiking backpack. It's in great condition, except for a tear on the water bottle pocket on the left side (see pictured). Here are the specs for the newer model: https://www.rei.com/product/227955/rei-co-op-trail-25-pack?srsltid=AfmBOooeIyV0bk2AWg9Lz3b-FeYebfKS16o0SCk4WGLPbJOeckVsUiHv