Reddit mentions of Anker Soundcore Mini, Super-Portable Bluetooth Speaker with 15-Hour Playtime, 66-Foot Bluetooth Range, Enhanced Bass, Noise-Cancelling Microphone - Black

For a small speaker in a compact space I recommend the Anker soundcore mini. Very clear vocals and a bit of bass. I really like this speaker for light listening.

It can stay plugged in and doesn't sleep for me, I have it plugged in to the dock with an aux cable.

https://www.amazon.com/Anker-SoundCore-Bluetooth-Speakers-Super-portable/dp/B01HTH3C8S/ref=sr_1_8?ie=UTF8&qid=1482786755&sr=8-8&keywords=anker+soundcore+bluetooth+speaker

Some really unhelpful non-suggestions in response to your question. Using 'the lightest possible speaker', people will not be able to hear your music unless they are very near your tent or hiking literally next to you. Terrain, vegetation, weather conditions etc, have a massive effect on how sound will travel, but generally, the sound from speakers in this weight category will diminish to an imperceptible level an extremely short distance away from them. If you're in doubt and you've had to set up camp near others for the night, just test it for yourself by walking away from the speaker until the music is inaudible and turn it down if necessary.

The best very lightweight speaker I've found is the X-mini WE. Bluetooth speaker with aux input - weighs 1.7oz. The sound quality is as good as other 3-4oz speakers I tested including a couple made by Anker. It's more expensive than other speakers in this weight category, but the sound quality is much better than others I tested.

For better low frequency response, another good one is the Anker soundcore mini, but it's significantly heavier at 7oz. This speaker is loud enough and has enough bass output that it is much more likely that you'd annoy people and disrupt wildlife with it if you're not careful with the volume.

2. This is pretty good for the price.

Personally, I agree. I like to bring a speaker with me, just because I like to have one on me. Even the ultralight people have some exceptions for what they like to bring with them ("luxury items").

For me, I've always recommended to others the Anker Soundcore series. The one I’ve linked is one of their small speakers, and I just want to stress that I’ve never owned this speaker, but I’ve heard great things about it.
I do however own the Anker “Classic” A7908 and it served me well as a beginner home Bluetooth speaker.

If you want a higher quality speaker (and don’t mind shelling out a few more bucks) then I’d recommend anything by JBL.

I own the JBL Flip 4 and I use it camping all the time. It’s my favourite speaker.
For lightweight purposes however, I’d recommend the JBL Clip 3. Both linked JBLs should be waterproof, just double check before buying.

Hope this helps.

Edit: Punctuation is a thing

Edit 2: Waterproofing bit wasn’t in there before

Even something small like the Anker Soundcore Mini will be a big improvment if used for music. For voice alone the internal speaker is acceptable.

I really like this one: https://www.amazon.co.uk/gp/aw/d/B01HTH3C8S/ref=mp_s_a_1_2?ie=UTF8&qid=1525672330&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=anker+bluetooth+speakers

It's small, has good bass and is loud. I use it every day for playing Just Dance. :)

Anche noi abbiamo avuto lo stesso dilemma per mia nonna e dopo varie ricerche abbiamo scelto una piccola cassa della Anker con pochissimi tasti e la porta per la scheda SD.

Purtroppo parte di default con la radio, e c'è la modalità bluetooth, ma c'è un pulsantino dietro da premere per passare alle canzoni. Devo dire che è reattivo.

So che non è esattamente quello che cercavi ma abbiamo fatto diverse ricerche e sembrava la soluzione migliore, perché (noi almeno) non abbiamo trovato qualcosa che potesse riprodurre solo musica senza radio e bluetooth, quindi nel caso suggerisco questo.

I just bought two of these for around the house and they are damn loud, Might work for what you want to do. I paid $17.00 each on sale, they apparently go on sale for that price about once a month.

https://www.amazon.com/Anker-SoundCore-Super-Portable-Noise-Cancelling-Microphone/dp/B01HTH3C8S/ref=sr_1_7?s=electronics&ie=UTF8&qid=1524587350&sr=1-7&keywords=anker+bluetooth+speaker

If you’re looking for a reasonably priced option, check out the Anker Soundcore Minis . They are less than $30 and can be paired together before connecting to Alexa device. It’s not a true “surround sound” but it is stereo sound with a pretty dynamic sound for the price.

I just bought this speaker the other day. Read the first Q&A. Boggles my mind.

I have a couple Anker sound cores that I like. I'd rather have my speaker in the cart rather than my bag. Being a fraction of the price is a bonus as well

This one fits in the cup holder of my cart

https://www.amazon.com/Anker-SoundCore-Super-Portable-Noise-Cancelling-Microphone/dp/B01HTH3C8S/ref=sr_1_2_sspa?s=electronics&ie=UTF8&qid=1511296330&sr=1-2-spons&keywords=anker+soundcore&psc=1
This on has a little better sound but is bigger

https://www.amazon.com/Anker-SoundCore-Bluetooth-Dual-Driver-Distortion/dp/B016XTADG2/ref=sr_1_3_sspa?s=electronics&ie=UTF8&qid=1511296330&sr=1-3-spons&keywords=anker+soundcore&psc=1