Size explorer
Slide the child's height.
Compare heights only. Riding still needs a child who sits unassisted, a fastened belt and supervision.
Cabin on checked
Stack them, hook them, roll them.
Litres, visually
43 versus 77.
The Check In holds roughly 1.8 times the Carry On. The Plus models match their originals: 43 litres cabin, 77 litres checked.
| Carry On | Carry On Plus | Carry On Pro | Check In | Check In Plus | Backpack | |
|---|---|---|---|---|---|---|
| Height, wheels in | 51 cm | 51 cm | 51 cm | 66 cm | 65.5 cm | 44 cm |
| Width | 38 cm | 39 cm | 39 cm | 45 cm | 46 cm | 31 cm |
| Depth | 29 cm | 30 cm | 23 cm | 31 cm | 33 cm | 11 cm, 22 expanded |
| Volume | 43 L | 43 L | 48 L | 77 L | 77 L | 15 to 30 L |
| Weight | 4.3 kg | 4.8 kg | 3.5 kg | 6.5 kg | 5.9 kg | Light |
| Seat capacity | 100 kg | 100 kg | 100 kg | 100 kg | 100 kg | n/a |
| Child seatbelt | Yes | Yes | No | Yes | Yes | n/a |
Sources: Coolkidz MiaMily factsheet (originals), MiaMily published specs (Plus, Pro), MiaMily 2025/26 catalogue (backpack).
Cabin baggage
Will it fly as carry-on?
MiaMily designs the Carry On to fit most airline overhead compartments. Australian domestic carriers publish their own limits, and some are tighter than the international norm, so check yours before you fly. The Check In is checked luggage.
Cabin FAQsWhat are the dimensions and weight of the Carry On?
Carry On: 51 × 38 × 29 cm including wheels (20 × 14.9 × 11.4 inches), 4.3 kg, 43 litres. It is the same footprint MiaMily describes as fitting most airline overhead compartments.
What are the dimensions and weight of the Check In?
Check In: 66 × 45 × 31 cm including wheels (25.9 × 17.7 × 12.2 inches), 6.5 kg, 77 litres.
Can I bring MiaMily luggage on a plane as cabin baggage?
The Carry On size is designed to fit in most airline overhead compartments. Airline cabin policies and weight limits vary, particularly on Australian domestic carriers, so we recommend confirming your carrier's dimensions before flying. The Check In and Check In Plus are checked luggage.
What are the dimensions of the Plus and Pro models?
Carry On Plus: 51 × 39 × 30 cm, 4.8 kg, 43 litres. Check In Plus: 65.5 × 46 × 33 cm, 5.9 kg, 77 litres. Carry On Pro: 51 × 39 × 23 cm, 3.5 kg, 48 litres, the lightest and slimmest of the range because it has no ride-on seat mechanism. Figures are as published by MiaMily.
How big is the Expandable Backpack?
44 × 31 × 11 cm, expanding to 22 cm deep. That takes it from 15 litres to 30 litres. It is made from 100% recycled polyester with YKK zips and has 11 pockets, including a laptop pocket, a thermal bottle pocket and an anti-theft passport pocket.