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From the DVRT Sandbag Training System book:
> The simple answer is YES! Of course, you have to remain consistent with other important factors such as nutrition and sleep. Seeing the amazing results people get from applying the DVRT system even surprises me at times. It is the adherence to a program - based upon strong principles and using an amazing tool - that seems to bring about such change.
Naturally, I own the book above, and while there is a chapter in the book about DVRT programming, the "programming" still leaves a lot of unanswered questions. It's not as rigid and structured as traditional free weight programs like Madcow or BBB 531. You're better off figuring out what movements you want to improve in, and create your own workouts with exercises that are specific to those movements, starting with the basic movements and exercises and progressing to more complex ones from there.
Nevertheless, you can build size in various parts of your body, especially your core. Is it the most effective way to build mass? No, but that's an obvious one.
In my opinion, the best use of sandbags isn't for mass. It's for General Physical Preparedness and sports-specific training. Mass gain doesn't care what tools you use, as long as your diet is in check to produce mass gain.
i went with https://www.amazon.com/Rep-Fitness-Sandbag-Large-50-125/dp/B0798XL548/ref=sr_1_5?keywords=REP%2BFitness%2Bsandbag&qid=1662048909&sr=8-5&th=1 because I thought this would be better for building to deadlifts and also having my rig perma weighed down while working out.
Return it and exchange for bags that are dry. What you bought was from a pallet that had been stored outside or shipped in the rain. Check the replacements bags for moisture before buying. If you do not find dry - try Lowes. It sucks to spread sand out to dry.
Masonry sand is better and cheaper than play sand too. Both are washed and dried in a kiln before being bagged.
Put sand in contractor heavy mil plastic bags to stop dust and sand escaping. Are you using handled sandbags or strongman? If handled, look into the pre-filled Hyperwear workout sandbags and SandBells. If you are a prime member you can even get some sizes with fast free shipping.
Old towels may be better than Rogue pool noodles....
I think it is right that you will find the bag too long and starting at 150-160lb may make more sense. Brute force or a Rogue handled bag will give you more training options if you are not dead set on strongman. And the Hyperwear 160lb workout sandbag is already filled with 4-5 heavy sandbell giving you a bag that is easy to adjust and has many training options.
Would be great if you could find a box that has the strongman bags so you can try it out before buying the bag and getting sand to fill it.
I got the REP Fitness one from Amazon and it came with 4x50 lb bags. The bags nearly, barely fit in there (its tight) when filled up. Bag works "fine"
Physics is hard to fight. There are really good quality bags from Rogue and Goruck but any bag that is full is going to want to burst/break a seam. You have to leave a lot of empty space to extend the life and reduce leaks.
Take a look at the new Hyperwear sandbags with handles that use neoprene sandbell workout sandbags as the filler bags. Neoprene is elastic to absorb force and the shape is round to disperse the force from slams. They go up to 160lbs and arrive already filled. Sandbells do not leak and there is a warranty for a year on everything.
Discounted on Amazon with free shipping too
I gambled and bought an off brand from Amazon (YES4ALL) and have been pleasantly surprised. The price was a fraction of the Brute Force brand, and they have lasted 11 months and are still going strong. I liked them so well I reorderedd additional sizes.
Yes4All Sandbags - Heavy Duty Sandbags for Fitness, Conditioning, Crossfit - Multiple Colors & Sizes https://www.amazon.com/dp/B08115NFF7/ref=cm_sw_r_apan_glt_i_P9PSMESS51D2E0GJYT5Z?psc=1
Yes, you can make a 300 lb sandbag. But, I don't know if your duffel bags are big enough to do that. You need to measure them first and do a few quick calculations to determine if you can. For example, Quikrete Play Sand (most tutorials recommend play sand as filler material) come in 50 lb bags that are 0.5 cu ft in volume (also, don't go on Amazon to buy your filler material, it is very overpriced due to the weight of shipping; just go to your local hardware store). That means you need 6 bags for 300 lb, or 3 cu ft of sand. Most recommend you only fill the bag up three quarters of the way, to allow for the material to move around. Therefore, you need a 4 cu ft bag for 300 lb of sand.
Lets say you measure you duffel bags, which are cylindrical, and they are 42in. long and 16in. in diameter. That means the volume of the bag is
V = L*3.1415*D^2/4 = (42/12)*3.1415*(16/12)^2/4 = 4.9 cu ft
Which means they would be (3/4.9)*100% = 61% full. A little on the low side, but I think it would work. Therefore, you'd be able to use these bags for your sandbag. If your bags are smaller that 4 cu ft in volume, then you would have to use a different material. Pea gravel is sometimes recommended as filler material. However, a quick search seems to suggest that pea gravel for sale has about the same density as play sand (50 lb/0.5 cu ft = 100 lb/cu ft). So you need to be careful and make sure that it is denser. This gravel looks to have a density of 120 lb/cu ft, but again, don't buy from Amazon. It is way to expensive. This is just an example of the variability of pea gravel.
In summary, measure the bags, find their volume, and compare that with the 4 cu ft of sand you'd need for 300 lb.