I have had two of each of these for several years and love them! I bought the small "sack" first, then the large "pack", then another large one, then another small one!
I've knit, crocheted, embroidered, needlepointed, cross-stitched, or sewed all my life (age 50 is in my headlights now!) and have probably had at least two dozen other totes over the years. A project goes with me wherever I go. For knitting and crocheting, these have been the absolute best I've ever used. They meet my needs for convenience, portability, durability, and ease of use.
It's impossible to rate these too highly!