Welcome bag dimensions help!

I'm hoping a fellow WW user can help me out! I'm about to order welcome bags (basic brown) that are 8x4.75x10 inches. I drew the footprint on the back of a page at work (clearly busy day) and I'm thinking they won't be big enough! We're putting two water outlets in each,candy/granola bars etc and including a things to do paper in each one. Has anyone ordered this size before? I'm tracing out water bottles inside my pretend foot print and I just don't know if there's a better size. I'm a visual person so this is an absolute struggle this morning! Thanks in advance!