On the day of judgment, the nation's hope for protection will ultimately fail. Because the people abandoned the commandments of God and relied on empty rituals, they face a severe and harsh exile. The foreign idols they trusted to save them will not offer rescue; instead, these very idols will become a heavy burden, sharing the bitter fate of the defeated nation.
The primary approach among commentators is that the people will bear a literal, physical burden of suffering. The enemies leading the Israelites into captivity will force them to carry their heavy, worthless idols on their own necks as they march into exile [רש״י, מצודת דוד, ביאור שטיינזלץ]. However, this burden can also be understood symbolically as the weight of sin. The nation will carry the punishment for their complacency, having quietly tolerated and accepted the actions of the wicked kings of Judah who originally led them into idolatry [אברבנאל]. Expanding on this willing submission, another perspective suggests that the people had patiently and voluntarily accepted the yoke of this false worship, eagerly listening to the call of idolatry long before their punishment began [אבן עזרא, רד״ק].
The primary approach among commentators is that the specific objects of their worship were various false gods, though their exact nature reveals the depth of the people's betrayal. Some identify these objects as actual booths or tents erected specifically for the rituals of Molech [מלבי״ם]. The people took a false deity, or perhaps a massive star they viewed as the ruler of the heavens, and crowned it as their own king and god [רד״ק]. They chose a specific star, elevated it to divine status, and crafted its physical image to worship, with some identifying this deity as the planet Saturn, for which they carefully fashioned statues [אבן עזרא, רד״ק]. Alternatively, this specific idolatrous worship involved special baked goods and dough that the women would knead and prepare exclusively as offerings for these false gods [רד״ק, מלבי״ם].
This tragic scene creates a sharp and painful historical irony. When the Israelites originally left Egypt in their exodus to freedom, they dwelled in holy booths and carried pure dough that had not yet leavened. Now, as they are driven out of Jerusalem into captivity, they will march out carrying the unholy booths of Molech and the tainted, idolatrous dough of their false gods [מלבי״ם].