I'll guess the usual suspects are about as light and cheap you'll find, GMRS-VI and the TR-505G. https://powerwerx.com/tera-tr505-gmrs-recreational-handheld-radio The BTECH you already have. I would suggest you just get anther one, they're fairly cheap. That way all the accessories are interchangeable, external speaker microphones, antennas, battery packs, mobile battery eliminators, programming cable etc. Then you only have to deal with one programming cable and software. You can make one code plug, radio memory file, and use it on both radios unchanged. Trying to keep two different radio's code plugs compatible is a bit of a pain. Been there done that many times. Finally you only need to learn one radio, not two, and the various menu items and settings. You also don't have to worry about which radio you grabbed and trying to remember how to use it later if that's not the usual one you carry around. On the last point I typically keep all my radio manuals in PDF format and loaded on the smart phone. If I need to use a feature I can't remember to access or setup the manual is right there.