Morgan -
Yes and no - I've used the bags with broken innner bags for long periods of time (our medium bag is currently full of loose sand because we used bad inner bags and a lot have broken) and we've had essentially no spillage - only some really fine dust, and that only when they're thrown, etc.
That said, the loose sand may get caught up in the zipper and give you trouble opening it again. I'd suggest using at least a full-size liner bag to give you the feel you want but to help prevent any zipper problems.
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