Hi, I will be traveling for a month in Malaysia with 3 children and want them to all have their own backpacks. They are 5, 5, and 7 yrs old. I was thinking of a daypack with back support like on this article and waist straps and zips that open all around for easy access. The packs must be small enough to go on as 'carry-on' with Air Asia.

Any recommendations? The smallest child is only 100cm tall so will need a fairly short backpack. I have seen the High Sierra Cirque 30 recommended on a website as 'best daypack/small backpack'. Is 30L too big for a child? Thanks.