I think it can be a lot healthier and cheaper to pick a designated day of the week and take a few hours to prepare some foods ahead for the coming week. I do this every week. I work full time and take some dance classes and go to meetings and also workout at a gym early mornings. So I don't have a ton of time to work with during the week. I will usually spend a few hours on Sundays (my day off work) making some lunches for the week, baking loaves of bread or energy bars (and freezing them individually) and if I have something that takes time to cook, like wild rice or dried beans, I will make a big batch on Sundays and store it in the refrigerator for the week. Then I just grab out what I need each day and off I go.
I don't know of too many prepackaged foods, but I do think larabars are gluten free vegan. I think there are some commercial organic cereals like Barbaras or Nature's Path that have a few gluten free vegan options. Food for Life has gluten free vegan bread. And Beyond Meat is gluten free vegan. They make vegan chickn strips and other fake meats. My Mom is an on again off again gluten free vegan and buys some of these things. I tried the Beyond Meat strips a time or two and liked them. There are also vegan soy and coconut based yogurts as well as almond milk yogurt that are all gluten free. And I have seen individual servings of soy, hemp, almond, and rice milk cartons.
Don't forget snacks like whole dates or figs, raisins, whole raw nuts, roasted pumpkin or sunflower seeds, fresh fruits. All are filling and easy to carry when on the go. If you can handle oats, all you need when bringing them along is a bowl, access to hot water, maybe some cinnamon or sweetener to throw over them. I have brought oats to hotels when traveling and just add hot water and spices/dried fruit/nuts to it for a quick breakfast. I am also as content to munch on mangoes and almonds for breakfast.
Oh, and there are nut butters, peanut butter, tahini....goes great on sliced apples, celery, rice cakes. Many grocery stores have deli hummus that is gluten free vegan and great to add to salads or in leafy wraps etc.
Hope this helps!
One of my favorite gluten free vegan meals is simply peeling, slicing and steaming some sweet potato, and mix it with canned black beans, steamed kale, coconut shreds, a splash of plant milk and some spices like curry powder, cinnamon, garlic powder. If you want to make a big batch of it this dish keeps in a tight fitting tupperware for lunches/dinners for four or so days.