Those who use swaddle sacks

Crequito

So we've successfully made the transition from bassinet to crib thanks to the Halo swaddle sacks. However, Vivi is on the verge of growing out of the N size 23.5 inches long now! so I've been using both N and S sacks. I use one for 23 nights in a row unless she has a bad spit up and it goes into the hamper earlier. I have 2 size S and am wondering if I should get more or if I should just do laundry more often since I'm not sure how long she'll be in size S anyway. Those using swaddle sacks any brand how many do you have that fit LO at one time?