Filling empty space between lumbers

Filling empty spaces between lumbers https://imgur.com/a/pdzubnv

I am pretty happy with my Covid-19 project: building a storage box for pool equipment. I was not necessarily looking at doing a waterproof box but I would still like to fill some empty spaces between my lumbers. What do you suggest me to do ?

submitted by /u/paxcou
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from DIY https://ift.tt/3dooZrx