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If there is play, then the bag is too big for your needs. If that’s the only bag you have, you can stuff a towel to fill in the extra space.
But big bag is better than a too small bag tho.
Interesting, so you seem to be saying it’s bad to have the opposite of my concerns which is not enough play. I was thinking if the bag were on it’s back and there was some amount of pressure placed on the front then the lens would be more at risk if they were the full length of the bag vs having some squeeze room on the bag. However, it seems you’re saying you would be fine with the lens fitting end to end, correct?
Oh I seem to have understood it as your camera bag is too big for your gears, my bad. If your gears are too big for your bag, I would suggest rearranging it somehow to fit properly, with extra cushion on the bottom end if possible. The top part will expand a bit in time. If you feel iffy about the fit, maybe sell it and get a different bag.