Fidella babysize flytai on the front with my 2 month old and Fidella Onbu on back with my 2 year old (plus an overfilled backpack diaper bag over my eldest). It was really hot today, so typically I'd put my oldest and the diaper bag in a wagon but our appointment was during nap time and my toddler tries to bust out of the buckles and climb out when she is tired and in the wagon (plus the wagon is a PITA when we have to go into places). We walked 3 miles, which is more than double what I typically do for tandem carries. I'm tired to say the least lol