For travel (and the inevitable 15' hotel pool) I use a surf leash and a pull buoy (an inflatable one, so it packs small). Get a 6' leash on amazon for <$20 and attach it to the stair/ladder rail. I find that my legs sink like a rock w/o the buoy, YMMV.

Relevant part starts at 1:44

---

ECMGN Therapy Silicon Valley:
Depression, Neurocognitive problems, Dementias (Testing and Evaluation), Trauma and PTSD, Traumatic Brain Injury (TBI)