It's much better to just throw them into the boil unbagged. You get much better utilization. If you have a spigot on your kettle, it's really easy to just let them filter themselves out by putting a wire mesh filter inside the kettle. If you siphon out of your kettle, you can afix a metal scrubby pad to the racking cane and that'll keep them out. You really shouldn't pour hot wort out of the kettle because it's dangerous and it aerates the hot wort. Hot side aeration leads to off flavors and chill haze and should be avoided.
The alpha acids in hops and the iso-alpha acids generated in the boil aren't all that soluble. A key part of the utilization of hops is the physical rolling action of a good boil. That's one reason an aggressive rolling boil is so important. If you want good hop flavor you need to allow them to roll around freely in the wort, and that means not using a bag. The bag will really interfere with good hop utilization.
Oh don't give me none more of that Old Janx Spirit
No, don't you give me none more of that Old Janx Spirit
For my head will fly, my tongue will lie, my eyes will fry and I may die
Won't you pour me one more of that sinful Old Janx Spirit