Taking a dive in a ball pit:

WWS Ball Pit for Kids / Baby Play Yard / Ball Pool / Baby Playpen / Fence for Baby, Folding Portable, No Need Inflate, More Than 12 Sq.ft Play Space, Two Color(Blue) https://www.amazon.com/dp/B07S8V92P9/ref=cm_sw_r_cp_api_i_nVFWEb2JWJR9D

Filled all the way to the top with extra balls :) :

BalanceFrom 2.3-Inch Phthalate Free BPA Free Non-Toxic Crush Proof Play Balls Pit Balls- 6 Bright Colors in Reusable and Durable Storage Mesh Bag with Zipper https://www.amazon.com/dp/B07SRHMF8Q/ref=cm_sw_r_cp_api_i_QXFWEbSD42M4P