A quick search on google reveals that gold has a density of 19.32 grams per cubic centimetre. One minecraft block is one cubic meter in volume. Assuming that the block of gold is solid, this cubic metre would be equal to 1000000 (one million) cubic centimetres, meaning that a block of gold would weigh 19320 kilograms. Since a gold notch apple requires 8 gold blocks (154560 kg) plus the weight of the apple, which is on average around 100 grams. These are stackable up to 64, and if Steve fills his inventory and his hotbar with 36 stacks of these apples, he would bear a load of 356106470.4 kilograms. This would further increase if he were to carry full shulker boxes of these apples as the weight would multiply by another 27 times, bringing the total to 9614874700.8 kilograms. This calculation would exclude the weight of the actual shulker boxes, because of course they are fictional items so there would be nothing to really compare them to for the purpose of calculations their weight. Now back to that number. Simplified and rounded to 4 digits for conversion into scientific notation, Steve would be carrying 9.615×10^9 kilograms. For comparison, the titanic was calculated to be roughly 52,310 US tons, which converts to 47454834 (4.745×10^7) kilograms. If we divide the the calculated weight for what Steve can carry in notch apples by the weight of the titanic, we can discover that Steve would be able to carry upwards of 202 and a half titanics. In conclusion Steve is one swole boi.