The word meal replacement has a lot of meanings. I sometimes skip meals so I tend to have some stuff in my house to make up for it.
I think the most often used meaning for meal replacement is a canned liquid shake. or some of the powders that you mix up with water or milk. I don't know if any of the canned stuff is vegan but I stopped getting that stuff years ago. First off they are expensive. Second, most of them are loaded with sugar and chemicals. However, for real emergencies I would go with Soylent. One of my friends keeps a case in his trunk. He worries about a real emergency (like an earthquake) and this is so he won't starve. It is definitely not Every Day Food (despite what they claim) but it is a very good emergency ration. I haven't tried Huel but it has gotten some good press.
Staying in the liquid shake category, I'm a big proponent of the DIY genre. If you have a big blender you can just whip up 4 servings at once. Separate them into tumblers and stick them in the freezer. I always keep one in the frig. But if you run out of defrosted ones you can still take a frozen with you for later. they defrost pretty quick. You can even throw a frozen one in your bag in the morning and have it for an after workout snack. Or if you have to work late - for dinner.
I don't have a big blender anymore but i still have a little one. I just learned this trick last month and I love it. Put the fixings for one smoothie in a zip lock bag, either with or without the milk, and stick it in the freezer. then when you need one just blend it up. Almost every smoothie can be made vegan by using plant milk.
I rarely add protein powder to my smoothies because I think they pretty much ruin it but you can do that if you want. We have a few threads here on protein powder if you are interested.
I think Soylent and Huel both make bars that you can just keep in your bag or glove box. A good thing to do with bars is buy a box online and then just stash them.
If you are at a 7-11, I'm pretty sure most of the Builder Bars that are 20 g protein are vegan.
The other option is to just make your own. One afternoon of baking can produce something like 30 homemade "energy-bars" or 60 energy balls. At least a month's worth.
Maybe the best strategy is to plan ahead and make some meals that can be made in bulk and frozen, reheated and eaten on the go.
PB&J sandwiches are really cheap, easy and fast.I like to make a whole loaf's worth and freeze them right in the bag the bread came out of. They defrost pretty fast and if you slice them in half they can be eaten with one hand.
I also like to make burritos about once a month and freeze ten. I put one each in a zip lock bag and then just re-use the bags. They nuke up in like 2 minutes and then if you don't make them very big you can eat them one-handed.
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https://soylent.com/?utm_source=goo...w6yBIk12r6cYJj7nQYrtjUNj2KphiJ-YaApqFEALw_wcB
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https://www.pinterest.com/nikeshaspencer/meal-replacement-smoothies/
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https://www.wellandgood.com/good-food/the-6-best-vegan-protein-bars/