The nest is relatively small compared to all the comb honeybees built. Bombus impatiens is the common one around here, and I assume for you as well. They will have a few hundred bees at the peak. I've only done a handful or so, but I have found that photocopier paper boxes with cover work well. You want to move the nest as gently as possible into the box. If possible, leave a corner or an area free for them to defecate while contained. A 3/4" entrance hole is adequate. The weather is warm enough now, and the population should be large enough that you don't have to worry about providing any nesting material, just place the nest into the box. If you wait until dusk, they will be less flighty, but may be more defensive, depending on how cool the temperature is. Keep in mind that they do not make honey, and only store enough nectar for a few days, so it is always a good idea to supplement them when disturbing and relocating the nest. I find a 1:1 syrup soaked sponge works great. Bumbles tend to be docile, but can get a little defensive when you start messing with their nest. They don't have a barbed stinger, so they can sting you repeatedly and they CAN sting thru nitrile gloves, trust me :shock:
Keep them in a protected shady area so they don't get afternoon sun. Sounds like this would be a great one to get since the nest should be easy to access. It can be a little more challenging when the're in the ground and you have to dig it out. Bumbles are great bees and it is very interesting to observe them and to see how different they are than honeybees.