Boom 3i

Buy him an Earfun UBOOM X for dorm parties. For his outdoor activities, add the Soundcore Boom 3i. Both speakers should fit within your budget, and they will give your grandson so much more than a Flip or UE Boom would.

I have the Soundcore Boom 2 and I like it a lot. I have used it in my bathroom and it sounded great. However I recently bought the Bose Soundlink Flex SE and I found them to be excellent. I prefer the Bose and they are waterproof. The soundcore cost me 75. And the Bose speakers were 99 each. The soundcore boom 3i recently came out and it is small and compact and has a great sound. It’s at Costco for 99. Either way I do really like the soundcore but the Bose speakers definitely match my needs more. Note: the soundcore boom 2 was recently heavily discounted at Costco for 49. I don’t know if any are left.

I like the Charge 6. Flex 2 is also a great option but for your needs the JBL is more appropriate.  For something fun that doesn't get mentioned a lot, the Boom 3i is really good 

As someone who's owned a shit ton of speakers since 2018 id go wuth something from wking or tronsmart..... my at home speakers are set of jbl partybox 110s ive had em since their release but ive sold the jbl boombox 3 wifi ive returned the jbl charge 6 and flip 7 ive returned the sony ult 5 ive returned the bose max why cuz of wking and tronsmart .... the wking d320 smokes the flip 7 in every way besides deep bass bit the kicker is thats only if ya play the flip 7 at 60 percent or less volume .. anything over that and sound goes to shit which is why I returned it and same goes for the charge 6 plus both their battery life is way overrated if ya add any bass and treble and play em at 60 percent or more volume the battery life is easily cut in half plus ya can't make or take calls with them..... but also the wking x20 is still for price of it and sound and features its literally unbeatable still today and that speaker is why I sold the jbl boombox 3 wifi I think only jbl speaker that is worth its pricetag is the speakers in their partybox lineup those speakers are bad fn ass but also tronsmart man have they ever impressed me since I got my first speaker from them.. the tronsmart mirtune h1... right away bought a 2nd for tws... thats why I returned the soundcore select 4 go the bose micro 2 and the jbl clip 5....but I now also own two of their trip 2 speakers and the fiitune x30 but for a shop id easily buy their bang 2 speaker..... sorry for long rant but I will never buy bamebrand speaker again after now owning multiple speakers from wking and tronsmart ..... both are becoming what soundcore used to be before they focused on marketing over sound but theyre producing speakers that cost consumers a lot less and sound as good or better along with having phenomenal accompanying apps to fine tune then with eq and update them. Soundcore got lazy and focuses too much on gimmicky shit and marketing ... their almost 10 yrs old motion + still smokes everything they've released since then for sound quality especially their 300 and boom 3i.... back then they focused on actual sounf but def arent doin so anymore so if I was you for smaller speakers id go with the mirtune h1 or the trip 2 or d320 or lil bigger and id go wuth the bang 2 or wking x20

try the soundcore boom 3i