The catalog taxonomy files Inscription Bag under Container. Everything listed below shares that subclass, which makes this a focused market view rather than the whole Container shelf.
Inscription Bag listings clear and replenish at whatever pace the in-game market sets; some subtypes trade in volume, others sit static for stretches. The price-history chart on each row's detail page makes that pattern visible at a glance.
Sort the table by item level or required level to find what matters for your character, or click through to any row for its full price-history chart across realms and game versions.