Pale imitations of true Bags of Holding, these lesser creations bear only a tenuous connection to the distant plane. Items held within still exist (and therefore retain some portion of their mass) on the Prime Material. The degree to which this is true varies according to the bag's craftsmanship.
These magic containers are essential for inventory management, and can hold many items, both large and small. The weight of the items within will still be a factor, however, especially when added to that of the container itself.