NIEWTR Toddler Boys and Girls Cotton Pants Lightweight Trousers Kids Summer Casual Solid Sweatpants 2T 3T 4T 5T 6T 7T 8T 9T Boys Uniform Dress Pant(A-Brown,7-8 Years)

I'm loving this pack so far. It's really streamlined so while it has tons of room for items, it doesn't feel bulky. Nothing moves around while running. I fit just under the max size for medium, and only the medium was in stock so that's what I've got. However I didn't take into consideration my measurements when wearing many winter layers. So it's a little on the small side now, but still fits. But I'll need it more in the summer when I've only got the one layer so I think it will fit perfectly then! Just remember to measure with all the layers that you'd be wearing a lot before making a size choice.