For larger folders of documents 3 ring binders and notebooks or oversized children's books for instance this mailer fit our needs very well. I could also see it being used for softer packages like shirts or sweaters if they did not need to be boxed Lightweight solid construction.
The envelopes are working out great! I was a little confused by why my booklets which are 8.5" X 11" did not fit into the 8.5" X 11" padded envelopes that I had purchased previously.