Expanding space for more pkg to be installed

Hi, im kinda new but i've been using OpenWRT for a while now but only using the pre-built one.
So i have an old router that i want to re-purpose and has a similar hardware specifications as ASUS WL-500gPv2 except that it has more flash memory which is 16MB.
So basically im using OpenWRT firmware for ASUS WL-500gPv2 and its working fine but i want to install more pkg but its saying that more space is required. Since my router (Catchtech-5354u) has twice more space than ASUS WL-500gPv2 and using its firmware limit it to just 8MB (this is just my guess), its possible to expand it to to able to use the 16MB so I can install more pkg?

Thanks for the response. Using flash drive is an option, yes but I'm curious if the OpenWRT firmware for WL-500gPv2 which has 8MB of flash memory also transpose to the router with 16MB flash memory or some part of it is just lying their hidden and un-utilized?

The relevant techdata and device pages:

The information appears to be pretty conclusive.

Firmwares are designed to use all flash space available.
Unless you are using x86 and devices utilizing memory cards, etc, where available storage can vary.

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